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    电业安全工作规程试题试题答案软件


    the different aspects of this communication process are emphasized by three perspectives. which of the following is not included?

    which of the following emphasizes the various components of communication including a sender/receiver, message, channel, and context?

    ________ refers to international use of nonspoken symbol to communicate a specific message.

    which of the following is not included in the body language?

    as early as 1952, raymond williams wrote a book on the definition of culture and he defined culture as “the total way of life of a people”.

    generally speaking, formal culture is commonly known as capital letter "c" culture, namely a country's geography, history, nature, politics, philosophy, literature, economy, education, science and technology, etc.

    the symbolic nature of communication means that the words we speak or the gestures we make have no inherent meaning.

    generally speaking, communication style combines both language and nonverbal communication.

    the same message people receive always conveys the same information even in different contexts.

    the different aspects of this communication process are emphasized by three perspectives. which of the following is not included?

    which of the following emphasizes the various components of communication including a sender/receiver, message, channel, and context?

    ________ refers to international use of nonspoken symbol to communicate a specific message.

    which of the following is not included in the body language?

    as early as 1952, raymond williams wrote a book on the definition of culture and he defined culture as “the total way of life of a people”.

    generally speaking, formal culture is commonly known as capital letter "c" culture, namely a country's geography, history, nature, politics, philosophy, literature, economy, education, science and technology, etc.

    the symbolic nature of communication means that the words we speak or the gestures we make have no inherent meaning.

    generally speaking, communication style combines both language and nonverbal communication.

    the same message people receive always conveys the same information even in different contexts.

    “intercultural competence” involves four elements of linguistic and cultural knowledge, behavioral habits, communicative skills, and values and morality. what is the significance of mastering intercultural competence?

    how many official languages does the first table mention?

    our apartment has the most _____ design like automatic washing device for cars, sound-control system for lights and house appliances.

    which comment is not included in description of zhang qian?

    vlad allied himself with foreign countries, and restored the social order destroyed by years of wars.

    in chinese, ______ can be expressed with comma, semicolon or even without punctuation.

    the internal expression of this aesthetic standard is artistic conception, while the external expression is rhythm and phonology.

    being located in west asia and adjacent to europe, iran, the ancient persian kingdom, has been influenced by ancient babylonian (巴比伦) culture, byzantine (拜占庭) art and chinese painting since ancient times.

    as a result, many families dissolved with little ceremony.

    chinese had mastered the technology of elting bronze approximately 5,000 years ago and iron tools came into use during the ___________.

    "during ________ reign, he dispatched zheng he to lead a fleet to make seven far-ranging voyages. "

    in chinese history, ________was regarded as the first emperor who unified china in ideology.

    the silk road refers to the ancient trade route connecting asia continent and european continent, usually it can be classified into ___________,southern silk road on the land and the silk road on the sea.

    zheng he, a eunuch of ming dynasty, is considered to be the most important chinese ___________ of all time.

    how many maritime expedition did zhenghe manage in ming dynasty?

    what nationality is marco polo?

    which is the proper way to express your thanks for a all personal favor in western culture?

    once you get to know your mistakes, you should ___________ them as soon as possible.

    we attended a ____ of the new manufacturing process.

    people need opportunities to make a “midlife review” to _____ to the later stage of employed life.

    according to orce contract, my huand has _____________ to our children at weekends.

    people need opportunities to make a “midlife review” to _____ to the later stage of employed life.

    according to orce contract, my huand has _____________ to our children at weekends.

    the administration warned any violations of the ban would ________ harsh punishments and invited audiences to monitor how well the tv stations follow the regulations.

    all hallows’ day is on __________.

    the cultural significance of the eyo festival is its usage in the ______ of a king(obas) or chiefs.

    how many intangible cultural heritages are there in china by the end of 2018.

    "___________ comprises of items that must be provided on the actual wedding day.

    the yoruba traditional wedding attires are scheduled for __________.

    what are the four major classic nanxi?

    ________, the wife of yellow emperor, is said to be one of the two most important deities of silkworms.

    yoga is for physical, mental and spiritual________.

    yoga helps us maintain a balanced __________, weight reduction, cardio and circulatory health.

    ________ slowly and deeply through your nose. keep your shoulders relaxed. your abdomen should expand, and your chest should rise very little.

    “ethnocentri” is the tendency to think of one's own culture as being at the centre of the world; in other words, to assume that his own culture' s way of thinking and acting is more natural, normal and correct the way people from other cultures think and act.

    what is the indian prime minister narendra damodardas modi’s attitude toward yoga?

    the blood __________ in the body and provides what the body needs.

    she has ___________ a large sum of money from her father.

    the __________ expressed their passive view about the government’s policy.

    in american universities, classes are often arranged in more flexible ______ and many jobs on campus are reserved for students.

    i will repair this new tv set without charging because it is under ________.

    the purpose of this test is to measure students' __________ to learn instead of their present achievements.

    we would never have secured our independence without the aid you __________.

    the _____________ of the member countries is supposed to be held recently at geneva.

    which type of chinese company has the highest proportion of trade on b&r?

    almost anyone involved in the e-commerce industry recognizes the ___________ that china holds.

    what is the total railway mileage of china by the end of 2017?

    how many bike sharing companies signed an agreement with the national development and reform commission (发改委) and the national information center (信息中心) on april 27th, 2017, authorizing the sharing of user data.

    the administration warned any violations of the ban that would ________ harsh punishments and invited audiences to monitor how well the tv stations follow the regulations.

    fran’s point is that they may have been laughing to help make the situation more comfortable rather than to make fun _________ peter.

    which of the following dimension is not the necessary dimension of intercultural communication competence?

    if you’ve gone to the trouble of keeping your old iphone or ipad going, it’s worth updating it to keep this important _______.

    what are the major characteristics of ethiopian industry?

    ethiopia has great potential to grow in the world textile and apparel supply chain majorly because ethiopia has the following advantages:

    what are the major opportunities of wenzhou enterprises through b&r?

    which topics should be avoided in communication in other countries?

    why do chinese people tend to laugh while listening to a foreigner speak chinese?

    who characterized today’s world as a “global village”?

    in contemporary china, most students __________the brand and price of clothes to pursue fashion.

    which of the following might not happen in patrilineal society?

    ghana is a nation in __________.

    family is a social unit of two or more persons related by blood, marriage, or ________and having a shared commitment to the mutual relationship.

    when talking with friends, which topic would chinese and tanzanians mostly like to use?

    which one of the following statements about saudi arabia is correct according to the micro-lecture?

    which one of the following statements about pakistani’s attitudes is incorrect according to the micro-lecture?

    what policy does the thailand government carry out to benefit most thai people?

    in indian, it is unnecessary to invest in education for a better quality of people’s life.

    xin ming came to the capital city to find a job, so he is a(n) ___________ worker.

    she is a girl from hong kong sar. sar in “hong kong sar” refers to ___________.

    in western countries such as ghana and nigeria, 6 is not a lucky symbol in terms of religion. it is a symbol of doom, _______ and evil.

    the main religion in afghanistan is ___________.

    malaysia is in ___________ .

    we need to be aware that the ___________ attitudes of writers are precisely the way cultural conflict is encouraged.

    not only was our defect rate lower, but the architecture and design were __________.

    this natural _________ and caring helps to be really effective at helping others through problems.

    regional__________is a cognitive structure concerns about the knowledge, attitude and anticipation toward the people who lived in a certain region.

    steve thinks that american instructors are ________so that in the us lin’s staff would get ________ training than they could get locally.

    how to prepare yourself for becoming an effective b&r cross-cultural communicator?

    while the learner reaches a higher language level, there still exist many barriers in his/her language communication.

    the insurance company paid him $10000 in ________ after his accident.

    the lady in this strange tale very obviously suffers from a serious mental illness. her plot against a completely innocent old man is a clear sign of __________

    ________ students should be motivated by a keen interest in theater and should have some familiarity with plays in production.

    encouraged by their culture to voice their opinions freely, the canadians are not afraid to go against the group __________, and will argue their viewpoints enthusiastically, though rarely aggressively.

    which of the following statement is not one of the reasons for that mandarin is used in china?

    _________ is used to describe things that deal with the meanings of words and sentences.

    the common cohesive devices in both languages include reference, substitution, ellipsis and lexical cohesion.

    in english, there is a preference for ________.

    bran castle became home of vampires, and vlad the archetype of vampires in the modern literature.

    the word “dracula” means son of the ________

    the president ____________ a messenger to tell the premier what happened

    he had a talent ______________ by any other politician of this century

    ___________ took a strong liking to young marco and tasked him to deliver messages and make reports on other areas of the country.

    what is the abbreviation of all hallows eve ?

    yoga nidra (瑜伽休息术) is a state of conscious deep sleep that brings about relaxation, clarity and _____.

    intangible cultural heritage doesn't include _______

    shinkansen is the first high-speed railway in human history put into commercial operation. when was it completed?

    which brand of shared bicycle was founded in 2014 by four beijing university students?

    what has ali-pay always taken as the core of its products and services?

    what is the highest proportion of commodity imported from b&r countries to china?

    which one is not wenzhou's advantage to explore business through b&r?

    which one is not the common gift in china?

    why are people always ethnocentric?

    what does glocalization mean?

    which of the following is not the cause of the different view of marriage?

    what should we keep in mind so as to narrow cultural differences?

    which communication style is one in which verbal messages reveal the speaker’s true intentions, needs, wants, and desires?

    when attributives are comparatively complex, in english, relational adverbs and pronouns are often used to establish the semantic and logical relationship between the subject and subordinate clauses.

    if chinese people get some kind of rewards or honour, they would treat their friends, which is a way of keeping _________

    to become better intercultural communicators, what do people need to do?

    dr. polidori wrote the beginning of the novel ___________ on that day, becoming the creator of vampire fiction.

    in the expressions of “温州”, “浙江”, “全国” and “世界”, “温州” is the _______of “浙江”.

    _________ refers to “relations of meaning that exist within the text”

    traditional healing methods in africa are derived from ________ beliefs that all things have a soul in them.

    china is now implementing the belt and road initiative, and iran is an important ______for the implementation.

    _________ attitudes view the outer world in terms of the self's subjective ideal, so they attempt to make the outer world more like the inner self.

    is the variable nominal, or ordinal? highest degree obtained (none, high school, bachelor’s, master’s, doctorate).

    is the variable nominal, or ordinal? how often feel depressed (never, occasionally, often, always).

    in the binomial distribution, when n is large, the distribution of y can be approximated by a normal distribution with

    π=odds/(1-odds)

    θ=π1(1-π1)/(π2(1-π2))

    probit(0.975)=?

    refer to the previous exercise1 and the solution to (b). a. the sample proportion of malformations is much higher in the highest alcohol category than the others because,although it has only one malformation, its sample size is only 38. is the result sensitive to this single malformation observation? re-fit the model without it (using 0 malformations in 37 observations at that level), and re-evaluate estimated probabilities of malformation at alcohol levels 0 and 7 and the relative risk. b. is the result sensitive to the choice of scores? re-fit the model using scores (0,1,2,3,4), and re-evaluate estimated probabilities of malformation at the lowest and highest alcohol levels and the relative risk. c. fit a logistic regression or probit model. report the prediction equation. interpret the sign of the estimated effect.

    when , the slope is the deepest.

    the median effective level is .

    in logit model, for j=3, logit[p(y≤1)]=log[(π2 π3)/π1].

    回流比增大,完成一定的分离任务所需的理论板层数( )。

    全回流的特征是( )。

    分离任务一定,回流比增大,操作费用( )。

    最小回流比可采用作图法和解析法计算,解析法适用于( )。

    采用直接蒸汽加热时,提馏段操作线与横轴的交点坐标为( )。

    采用直接蒸汽加热应满足下列情况( )。

    分离浓度不同的原料液,可在不同塔板位置上设置相应进料口。

    某精馏塔中装有20层塔板,塔板间距为0.45m,则该精馏塔的有效高度为( )。

    塔板效率具有下列不同的表达形式( )。

    等板高度是指分离效果与理论板的作用相当的填料层高度。

    某精馏过程的操作回流比为2,塔顶馏出液的流量为15kmol/h,操作条件下物系的汽化潜热为35 kj/kmol,则冷凝器的热负荷为( )。

    精馏过程的节能途径包括( )。

    对再沸器进行热量衡算时热损失可以忽略。

    对于馏出液组成恒定的间歇精馏过程,随着精馏时间的增加,回流比( )。

    间歇精馏具有以下特点( )。

    对于恒回流比的间歇精馏过程,各个瞬间的操作线彼此平行。

    教材244页习题6

    教材245页习题8

    对于常压下沸点较高或热敏性物系的分离,宜采用( )。

    蒸馏分离的特点为( )。

    对于甲醇-水二元物系的精馏分离过程,其中的甲醇为重组分,水为轻组分。

    在一定的压力下,对于苯-甲苯二元物系,随着苯的含量升高,溶液的泡点温度( )。

    在二元理想物系的x –y平衡相图中,平衡线与对角线之间的距离越大,则( )。

    汽液两相呈平衡状态时,汽液两相温度相同,汽相组成大于液相组成。

    对于二元理想物系,其相对挥发度可表示为( )。

    关于相对挥发度α,下列说确的是( )。

    泡点方程表示当汽液两相平衡时,汽相组成与平衡温度间的关系。

    平衡蒸馏装置应包括( )。

    在平衡蒸馏中,汽液两相的组成关系应同时满足平衡方程与物料衡算方程。

    简单蒸馏适用于( )。

    因为简单蒸馏为单级过程,故此简单蒸馏的物料衡算应该进行微分衡算。

    间歇精馏与简单蒸馏的本质区别是( )。

    对于精馏塔内从塔顶向下的n-1、n、n 1相邻3层塔板,以下关系式成立的是( )。

    在精馏塔进料板以上的塔段,上升汽相中易挥发组分向液相中传递,最终实现了上升汽相的精制,故此称为精馏段。

    下列计算内容属于精馏过程操作型计算的是( )。

    理论板假定成立的条件是( )。

    根据恒摩尔流假定,精馏段内上升的汽相摩尔流量与提馏段内上升的汽相摩尔流量相等。

    某精馏塔的精馏段操作线方程为,则操作回流比为( )。

    在下列物料衡算关系式中,表达正确的是( )。

    根据恒摩尔流假定,精馏段操作线方程为一直线方程。

    对于饱和液体(泡点)进料,下列关系式中表达正确的是( )。

    对于汽液混合物进料,进料热状况参数为( )。

    对于饱和蒸汽(露点)进料,下列关系式中表达正确的是( )。

    进料热状况参数对精馏段操作线方程和提馏段操作线方程均有影响。

    在理论板的逐板计算中,需要采用的方程包括( )。

    在再沸器内料液受热后部分汽化,故此,再沸器相当于一层理论板。

    对于饱和蒸汽(露点)进料,进料线(q线)的斜率为( )。

    在理论板的梯级图解中,下列各线交于图中d 点的是( )。

    进料温度越高,q值越大,平衡线与操作线距离越近,所需的理论板层数越多。

    教材244页习题2

    某间歇精馏过程每批操作的汽化量为90kmol,测得汽化速率为25kmol/h,辅助时间(包括加料、预热等)为1.5 h,则每批操作的周期为( )。

    对于萃取精馏过程,随着萃取剂加入量的增大,原有组分间的相对挥发度( )。

    对于恒沸精馏过程,选择夹带剂的主要原则是( )。

    萃取精馏常用于具有最低恒沸点溶液的分离。

    对于常压下沸点接近室温的液体混合物的分离,宜采用( )。

    某精馏过程的进料方程为y=2.165x-0.586,则进料热状况参数为()。

    某精馏过程的精馏段操作线方程为y=0.625x 0.355,则塔顶馏出液组成为()。

    某精馏塔的进料量为100 kmol/h,进料组成为0.565(摩尔分数,下同),馏出液组成为0.985,若塔顶轻组分的回收率为98.5%,则釜残液的组成为( )。

    在精馏计算中,若维持其他条件不变,将饱和蒸气进料改成过热蒸气进料,则所需的理论板层数( )。

    某操作中的精馏塔,若将回流比减小,其他条件保持不变,则釜残液的组成为( )。

    某物系的精馏分离过程需要16层理论板,若采用板式精馏塔,塔板间距为0.45 m,所用塔板的总板效率为64%,则该精馏塔的有效高度为( )。

    某操作中的精馏塔,保持进料量和进料热状况参数、馏出液和釜残液的组成,以及再沸器的汽化量不变,减小进料组成,则有( )。

    二元溶液连续精馏计算中,进料热状况的变化将引起以下操作线的变化( )。

    连续精馏塔的操作中若采用的回流比小于原回流比,则( )。

    精馏操作中,若进料组成、流量和气化率不变,增大回流比,则精馏段操作线方程的斜率( )

    间歇蒸馏和平衡蒸馏的主要区别在于( )。

    两组分连续精馏,最小回流比时,理论塔板数为( )。

    两组分连续精馏中,泡点进料时,表示精、提馏段的液体流量间关系的是( )。

    精馏中,泡点进料时,q线位于( )。

    精馏操作中,关于x-y图,下列说法中错误的是( )。

    精馏塔的塔顶温度总是( )塔底温度。

    精馏操作时,若qn,f、qn,d、xf、q、r、加料板位置都不变,而将塔顶冷回流改为泡点回流,则塔顶产品组成xd变化为( )。

    在二元连续精馏塔的操作中,进料量及组成不变,再沸器热负荷恒定,若回流比减少,则塔顶温度()。

    精馏设计中,当操作回流比增大时,所需塔径()。

    用水吸收空气中的氨,进塔时空气中氨的含量为5%(质量%),该吸收过程属于( )。

    气体吸收过程主要应用于以下场合( )。

    通过吸收塔对气体混合物中的溶质组分进行吸收,即可获得纯态的溶质。

    对同一溶质,在相同的温度下,溶解度随气相分压的升高而( )。

    吸收与解吸为互逆的过程,下列操作条件中利于解吸的是( )。

    气体在液体的溶解度是指液相中溶质的摩尔分数与气相中溶质的分压之间的关系。

    在一定的压力和温度下,气体1和气体2分别在水中溶解,若气体1的溶解度小于气体2,则溶解度系数h1与h2的关系为( )。

    亨利定律具有不同的表达形式,下列表达式正确的是( )。

    相平衡常数m 等于亨利系数e 除以操作的总压力p。

    对于逆流吸收过程,气相出口最低组成应( )。

    选择吸收剂的主要原则是( )。

    根据相平衡关系可以确定传质的推动力,传质推动力仅以气相组成表示。

    对于a和b的二组分扩散系统,两组分扩散通量的关系为( )。

    描述分子扩散的现象方程为菲克定律,对于a和b的二组分扩散系统,下列表达式正确的是( )。

    对于a和b的二组分扩散系统,在总浓度恒定时,组分间的相互扩散系数dab与dba相等。

    对于a和b二组分的等分子反方向扩散 ,二者的扩散通量关系为( )。

    对于a和b的二组分扩散系统,发生等分子反方向扩散的条件是( )。

    等分子反方向扩散过程通常发生在蒸馏操作中。

    在总压130kpa下,某组分a通过另一停滞组分b进行稳态扩散,已知在界面1和界面2处,组分a的分压分别为100 kpa和20 kpa ,则漂流因数为( )。

    对于组分a通过停滞组分b的扩散过程,下列表达式正确的是( )。

    一组分通过另一停滞组分的扩散过程通常发生在吸收操作中。

    气体扩散系数的主要影响因素为( )。

    液体中的扩散具有以下特点( )。

    液相中扩散的处理原则是,扩散系数和总浓度分别以平均扩散系数和平均总浓度代替。

    描述对流传质的基本方程为i( )。

    下列关于涡流扩散的描述正确是( )。

    层流的传质机理是分子扩散,浓度分布为一渐缓的曲线。

    根据双膜模型,可得出膜吸收系数( )。

    双膜模型(停滞膜模型)的要点包括( )。

    下列气膜吸收速率方程式中,表达正确的是( )。

    下列各阻力表达式中,属于气膜阻力的是( )。

    在气液两相间的传质过程中,溶质组分通过气膜和液膜的传质速率应相等。

    在下列吸收过程中,属于气膜控制的是( )。

    对于气膜控制过程,下列表达式正确的是( )。

    总吸收速率方程式中的推动力是以气相(或液相)主体组成与界面组成的差值表示的。

    在下列吸收速率方程式中,表达正确的是( )。

    使用总吸收速率方程式时,在整个过程所涉及的组成范围内,平衡关系须为直线。

    在逆流吸收过程中,操作液气比增大,操作线与平衡线之间的距离( )。

    在下列关系式中,反映吸收塔总物料衡算关系的是( )。

    吸收塔内任一横截面上,气液组成y与x之间的关系称为操作关系,描述该关系的方程即为操作线方程。

    下列关于吸收塔的塔径计算描述正确是( )。

    完成一定的吸收任务,操作液气比越小,则出塔吸收液的组成越低。

    ( 10分 )教材188页习题8

    以下哪个缩略语用于表示可为单个用户提供10米覆盖范围的网络?

    一个学生在自习室里使用无线连接到他的实验合作者的笔记本电脑,他正在使用的是( )无线模式?

    天线主要工作在osi参考模型的哪一层?

    关于infrastructure模式的无线网络,下列说确的是( )

    无线网络的数据链路层,包含如下哪几个子层?

    ad hoc网络是一种没有基础设施支持的移动网络

    ad hoc模式的无线网络中,任意两个节点都可以直接通信

    ad hoc模式的无线网络是一种对等式网络,其所有节点的地位和角色平等

    双线地面反射模型中,传播损耗与传播距离的关系为______。

    频率范围在30-300mhz的无线电波称为()。

    如果ap发射功率为100mw,那么对应的dbm值是?

    关于信号的带宽和相干带宽之间的关系及其经历的相应的衰落,以下说确的是______。

    多普勒扩展会引起以下哪些衰落?

    关于分集接收中的合并技术,以下说确的是___________。

    关于地波传播,如下说确的是________。

    分并技术能够抵抗快衰落。为了获得足够的分集增益,分集技术需要满足什么条件?

    下列关于无线传播机制,正确的是___________。

    对于p坚持ca,假设系统中平均有n个站点有数据要发送,则对于p的取值,要求___________

    在接收者的通信范围内而在发送者通信范围外的终端是___________

    列媒体访问控制技术中,不会发生数据冲突的有_________。

    下列选项中,属于非竞争的媒体访问控制技术有___________。

    在cdma传输系统中,每个站点都有自己唯一的码片序列。对所有的码片序列而言,如下说确的是________

    aloha系统中,当发送站点在规定的时间内没有收到接收方的确认信息,则表明传输过程发生了冲突,发送站点将立刻重新发送该数据帧。

    对于1坚持ca,当一个站点要发送数据包时,如果监听到信道是忙的,则继续监听信道的情况直到信道空闲之后立即发送数据帧。

    对于p坚持ca,当一个站点要发送数据包时,如果监听到信道是忙的,则会以p的概率发送数据,以1-p的概率延迟到下一个时隙。

    ca/cd不适用于无线网络。

    cdma中,假设站点a的码片序列为00011011,当站点a要发送0的时候,发送的二进制序列为00011011。

    使用2.4ghz的802.11b/g协议,其不重叠信道最多有几个( )

    ieee802.11a的数据传输速率和信号覆盖范围比ieee802.11b( )

    当一台无线设备想要与另一台无线设备关联时,必须在这两台设备之间使用相同的( )。

    根据无线网卡使用的标准不同wi-fi的速度也有所不同。ieee802.11b最高为__mbps。ieee802.11a最高___mbps。ieee802.11g最高也是___mbps。

    ibss英文什么意思 ( )

    以下采用ofdm调制技术的802.11协议是( )。

    确定无线设备间信号传播距离的最优方法是( )。

    802.11协议定义了无线的( )

    增大蜂窝系统的频率复用通过采用( )

    g系统采用的多址方式是( )

    蜂窝系统的频率复用技术可以使系统容量( )

    g支持的业务包括承载业务,电信业务和( )

    以下位置区划分错误的是( )

    g系统中,用户寻呼所使用的标识码为( )

    以下那种不是g系统的控制信道:( )

    若定义移动台的最大发射功率为30dbm,则其对应的功率为多少瓦?( )

    以下关于位置更新的说明,哪个是错的( )

    当移动台接入网络时,它首先占用的逻辑信道是:( )

    一个区群所包含的小区数,不可能的是( )

    关于蜂窝移动网络中的频率复用与区群,以下说确的是( )

    移动ad-hoc网络使用多跳通信的好处有( )

    关于manets的平面拓扑结构,下列说确的是( )

    下列关于dma协议的描述,正确的是( )

    dsr协议的rreq报文包含如下哪些信息?( )

    关于dsr协议,如下说法错误的是( )

    mac协议中的退避机制对于信道接入的公平性起着至关重要的作用。

    平面结构的manet结构简单,所有节点地位平等。

    由于隐藏终端和暴露终端的存在,在单信道环境下,载波侦听经常失效。

    分级结构中,一般只有簇头节点才存储其他簇的路由信息。

    macaw协议中,rrts是由暴露终端发送的。

    表驱动型路由协议的路由维护开销较大。

    manet的分级拓扑结构一般不存在瓶颈,网络比较健壮

    maca采用了rts/cts握手机制。

    本课程视频中介绍室内设计师的职业发展要经历几个阶段?

    本课程视频中提及的将设计哲学中的本土化文化理念执行得最到位的设计师是

    用于绘制施工图的软件是

    在水电改造之前会完成

    用于绘制效果图的软件是

    非语言沟通包括

    注重细节,讲究生活质量的人群着装特点

    客户以直勾勾的眼神回复,表明客户

    与客户谈单过程中,不正确的表情是

    客户到公司谈单,应该把客户安排

    不属于前期拆除工程报价的是

    室内厨房空间设计中水槽的位置是可以自己自由选择的吗?

    玄关设计中换鞋坐凳的高度是

    基础设施的采购物件

    装修项目构成第一步是

    户型方正,户型合理

    关于量房工具的说法不正确的是

    对施工图绘制规范表述不正确的是

    软装配置的最后一步是

    下面说法不正确的是

    漫反射光电开关的工作原理是利用光照射到()上后反射回来的光线而工作的 。

    漫射式光电开关利用光照射到被测工件上后( )光纤而工作。

    生产线的供料单元用于检测料仓中有无工件的传感器是( )。

    plc在工作时候采用( )原理。

    下面不属于基本逻辑运算的是( )。

    电磁阀的线圈应接在( )。

    s7-200 art plc 最多有 ()个高速计数器。

    根据接收光的方式不同,光电式传感器分为反射式、对射式和漫射式三种。

    16进制的f转换为10进制是15。

    磁性开关在生产线中用于气缸的伸出或缩回的检测。

    在yl335b生产线上,用到了几种类型的传感器?它们的作用分别是什么?

    下列气动元件不属于控制元件的是( )。

    两位五通阀中的“五通”指的是( )。

    供料单元中用了( )个二位五通电磁阀。

    供料单元用到两个笔形气缸,其初始状态分别为( )和( )。

    供料单元共用了多少个传感器()。

    yl-335b生产线中的光电开关检测到元件时( )。

    生产线的供料单元用于检测料仓中有无工件的传感器是()。

    在供料单元用于检测气缸活塞杆位置的传感器为()。

    供料单元用了( )个光电式接近开关。

    供料单元用了( )个磁性开关。

    简述一下供料过程中各个气缸动作的过程。

    yl-335b生产线中的光电开关检测到元件时()。

    加工单元用了( )个磁性开关。

    加工单元用到的手指气缸初始位置为手指松开。

    加工单元用到的笔型气缸初始位置为活塞杆伸出。

    加工单元用到的薄型气缸初始位置为活塞杆伸出。

    简述加工工作的流程,包括传感器如何动作。

    装配单元用到的电磁阀为( )电控二位( )通电磁阀

    装配单元中摆动气缸每次动作应该()。

    装配单元中档料气缸的初始状态为伸出状态。

    装配单元中气动手指的初始状态为松开状态。

    装配单元中气爪升降气缸的初始状态为伸出状态。

    光纤传感器的黑色线接()。

    检测装配工作台有无待装配工件的传感器为()。

    落料机构落料时,先顶料气缸伸出,然后挡料气缸再缩回。完成落料后,挡料气缸伸出,顶料气缸缩回。

    生产线中使用的换向阀是电磁阀。

    手指气缸活塞伸出时手指为松开状态。

    判断:如果左侧料盘无料,右侧料盘有料,则让摆动气缸摆动或者复位,实现左右料盘互换。

    判断:在装配单元单站程序执行过程中,如果料仓有料,左侧料盘无料,则执行落料动作。

    变频器是针对异步电动机的调速装置。

    可以通过变频器的操作面板控制异步电机的启停。

    针对g120c变频器可以通过其操作面板实现异步电机的点动控制。

    判断:g120c变频器可以对异步电动机进行模拟量调速或多段速控制。

    判断:g120c变频器可以通过其上位机软件设置参数或读取过程数据。

    分拣单元用到了()种类型的传感器。

    分拣单元入口检测传感器检测到有待分拣的工件时候,才启动传送带。

    在分拣单元用到的光电编码器,作用是计算工件在传送带上的位置。

    判断:若光纤传感器的灵敏度过高,则无法区分黑色和白色工件。

    在分拣单元,传送带定位控制是由光电编码器来完成的,那么在分拣单元采用的光电编码器为哪种类型?

    在分拣单元中用到了变频器的模拟量调速。

    伺服控制系统定位精度高于步进控制系统。

    在伺服驱动上能够设置相应的参数。

    判断:在plc程序编制过程中,能够通过运动控制向导生成子程序,调用相应的程序。

    输送单元气动手指用于在各工作单元进行物料的搬运,其主要动作就是抓取和放下工作,由一个双电控二位五通电磁阀控制。

    输送单元伸缩气缸用于机械手臂的伸出和缩回,由一个单电控二位五通电磁阀控制。

    判断:输送单元回转气缸用于驱动手臂正反向摆动180度,同一个双电控二位五通电磁阀控制.

    抓取机械手装置从供料站出料台抓取工件,抓取的顺序是:手臂伸出→手爪夹紧抓取工件→提升台上升→手臂缩回。

    在输送单元,伺服电机通过同步轮和同步带带动滑动溜板沿直线导轨做往复直线运动,其中同步齿距为5mm,共12个齿,那么伺服电机每旋转一周,搬运机械手水平位移60mm。

    判断题 :输送单元提升气缸用于驱动整个机械手的提升和下降,由一个单电控二位五通电磁阀控制。

    tpc7062ks触摸屏的电源进线、各种通讯接口都在背面。

    tpc7062ks触摸屏的供电电源为24v直流电。

    可以使用put/get指令向导完成s7通信配置,也可以使用指令来编写通信程序。

    在自动化生产线设备的s7通信中,把输送单元art plc当做主站,其它各站当做从站来配置参数。

    判断:put指令是把本地的数据写到远程plc里。

    在系统全线联调时,当系统上电,以太网网络正常后开始工作。触摸人机界面上的复位按钮,执行复位操作,在复位过程中,绿色警示灯以 2hz 的频率闪烁,红色和黄色灯均熄灭。

    在系统联调过程中,系统的启动和停止信号是由触摸屏人机界面发出的。

    判断:在系统联调时,如果发生“工件不足”的报警信号,警示灯中红色灯以 1hz 的频率闪烁,绿色和黄色灯保持常亮。但是系统将继续工作,不会立即停止下来。

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