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    新乡复合肥事业造粒安全上岗搜题软件哪个好


    1. 信息论研究的目的就是要找到信息传输过程的共同规律,以提高信息传输的_________,使信息传输系统达到最优化。

    信息就是消息

    1948年,数学家_______发表了题目为“通信的数学理论”长篇论文,从而创立了信息论。(英文名,首字母大写)

    连续信源输出x的概率密度函数p(x)=1/2,-1≤x≤1,则此信源的微分熵为()bit

    在下面空格中选择填入的数学符号“=,≥,≤,>”或“<” h(xy) h(y) h(x∣y)

    熵功率与平均功率的数值关系为

    当离散信源输出服从 分布时,其熵为最大。

    信道输入与输出间的平均互信息是输入分布的 函数。

    信道输入与输出间的平均互信息是信道传递概率的 函数。

    在下面空格中选择填入的数学符号“=,≥,≤,>”或“<” h(xy) h(y) h(x)

    对连续集的熵的描述正确的是()

    离散平稳有记忆信源符号序列的平均符号熵随着序列长度l的增大而增大。

    必然事件和不可能事件的自信息量都是0 。

    根据信息不增性原理,信息传输系统中接收端获得的信息量小于发送端发出的信息量。

    在平均功率受限情况下,非高斯噪声信道的容量要大于高斯噪声信道的容量。

    离散信源的序列熵等于各个符号的熵之和。

    某事件发生的概率为0.125,则其自信息量为()bit。

    八元编码系统,码长为3,第一个符号用于同步,每秒1000个码字,它的信息速率为()bit/s。

    彩色电视显像管的屏幕上有 500000 个像元,设每个像元有64 种彩色度,每种彩度又有 16 种不同的亮度层次,如果所有的彩色品种和亮度层次的组合均以等概率出现,并且各个组合之 间相互独立。则每秒传送 25 帧图像需要的信道容量为多少?

    离散对称信道达到容量时,输入与输出均服从等概分布

    信道容量随信源输出的概率分布的变化而变化

    信道容量是信道中能够传输的最小信息量。

    某信道输入熵为h(x),输出熵为h(y),若信道为无噪有损信道,其容量为h(x)。

    对于准对称离散无记忆信道,当输出符号等概分布时,信道达到其信道容量。

    根据shannon公式可知,通过增大带宽或增加信噪比可以提高信道容量。

    若要以r=10^5bit/s的速率通过一个带宽为8 khz、信噪比为31的连续信道传送,一定可以实现。

    任意两个典型序列的联合序列都是联合典型序列

    最大后验概率译码准则是使平均译码错误率最小的准则。

    最大似然准则是最佳译码准则。

    当信源输出等概分布时,最大似然准则是一种最佳译码准则.

    离散无记忆信源在进行无失真不等长信源编码时,编码效率最大可以达到 ______。

    等长编码的效率一般小于不等长编码的效率。

    对含4个符号的离散信源进行二元信源编码,码c={0, 10, 01,111}是唯一可译码。

    典型序列出现的概率一定大于非典型序列。

    craft不等式可以作为唯一可译码的判定判据。

    huffman编码是最佳不等长码。

    shannon编码、fano编码和huffman编码中,编码方法惟一的仅有shannon编码。

    算术编码和lz编码都属于无失真的分组信源编码。

    关于伴随式的描述正确的是________。

    若线性分组码{00011,10110,01101,11000,10010,10001},经过二元对称信道后输出码字为01100,则根据最小距离译码准则,应译为____________。

    线性分组码的一致校验矩阵各行之间是线性无关的。

    线性分组码一定包含全零码。

    任意两个典型序列的联合序列都是联合典型序列。

    最大后验概率译码准则是使平均译码错误率最小的准则。

    最大似然准则是最佳译码准则。

    当信源输出等概分布时,最大似然准则是一种最佳译码准则。

    如某线性分组码的最小汉明距 dmin=6,它一定能纠正小于等于____个的随机错误比特。

    某线性分组码{00011,10110,01101,11000,10010,10001},该码的最小汉明距离为______。

    线性分组码n(7,3)的码率为___。(小数点保留两个有效数字)

    率失真函数的下限为()

    信息率失真函数 r(d)的定义域为[dmin,dmax],其中 dmin=0,dmax 是满足r(d)=0 的所有 d 中的最大值。

    r(d)函数是平均失真的下凸函数。

    在限失真信源编码中,容许的平均失真度d越大,所要求的信息率r越小。

    熵功率与平均功率的数值关系为

    x, y 和z为离散型随机变量,i(xy;z) ____i(x;z)

    二元码_____。

    令信道输入端熵为h(x),输出端熵为h(y),若该信道为无噪有损信道,其信道容量为

    当离散信源的输出服从 ___ 分布时,其熵值为最大。

    在现代通信系统中,信源编码主要用于解决信息传输中的可靠性问题,信道编码主要用于解决信息传输中的有效性问题。

    根据信息不增性原理,信息传输系统中接收端收到的信息量小于发送端发出的信息量。

    在限失真信源编码中,容许失真度d越大,所要求的信息率r就越小。

    令x,y,z是概率空间,则一定成立。

    如果信源编码速率r
    craft不等式可以判别唯一可译码的存在性,也可以判别某码是否为唯一可译码。

    准对称dmc信道输出符号等概时,该信道达到信道容量。

    以r=105bit/s的速率通过一个带宽为81khz、信噪比为31的连续信道传送数据,一定是可行的。

    若(n,k)线性分组码的最小汉明距离为4,则该码一定不能纠正2个错误比特的情况。

    无失真信源编码方法中,huffman编码属于分块编码,而算术编码和lz编码属于连续编码。

    必然事件和不可能事件的自信息量都是0 。

    在平均功率受限情况下,非高斯噪声信道的容量要大于高斯噪声信道的容量。

    典型序列集的元素数目大于非典型序列集。

    huffman编码是最佳不等长码。

    最大似然准则是最佳译码准则。

    设随机变量x和y的联合分布如下所示:,则h(x)= __ 比特(保留一位有效数字)

    接上题,h(y)=___比特(保留一位有效数字)

    接13题,i(x;y)=___(保留四位有效数字)

    令离散无记忆信源 则s的最佳二元码相应的平均码长=____(保留三位有效数字)

    接上题,编码效率=____(保留两位有效数字)

    设离散无记忆信道输入为{0,1},输出为{0,1},信道转移概率矩阵为。则信道容量为_____比特(保留四位有效数字)

    接上题,其最佳分布为q(0)=___(保留一位有效数字)

    接19题,其最佳分布为q(1)=___(保留一位有效数字)

    时间离散的可加高斯噪声信道,若限定输入平均功率上限为1,噪声服从高斯分布n(0,1),则该信道信道容量为____比特。(保留一位有效数字)

    接上题,最佳输入分布为____分布

    熵功率与平均功率的数值关系为

    x, y 和z为离散型随机变量,i(xy;z) ____i(x;z)

    二元码_____。

    令信道输入端熵为h(x),输出端熵为h(y),若该信道为无噪有损信道,其信道容量为

    当离散信源的输出服从 ___ 分布时,其熵值为最大。

    在现代通信系统中,信源编码主要用于解决信息传输中的可靠性问题,信道编码主要用于解决信息传输中的有效性问题。

    根据信息不增性原理,信息传输系统中接收端收到的信息量小于发送端发出的信息量。

    在限失真信源编码中,容许失真度d越大,所要求的信息率r就越小。

    令x,y,z是概率空间,则一定成立。

    如果信源编码速率r
    craft不等式可以判别唯一可译码的存在性,也可以判别某码是否为唯一可译码。

    准对称dmc信道输出符号等概时,该信道达到信道容量。

    以r=105bit/s的速率通过一个带宽为81khz、信噪比为31的连续信道传送数据,一定是可行的。

    若(n,k)线性分组码的最小汉明距离为4,则该码一定不能纠正2个错误比特的情况。

    无失真信源编码方法中,huffman编码属于分块编码,而算术编码和lz编码属于连续编码。

    必然事件和不可能事件的自信息量都是0 。

    在平均功率受限情况下,非高斯噪声信道的容量要大于高斯噪声信道的容量。

    典型序列集的元素数目大于非典型序列集。

    huffman编码是最佳不等长码。

    最大似然准则是最佳译码准则。

    设随机变量x和y的联合分布如下所示:,则h(x)= __ 比特(保留一位有效数字)

    接上题,h(y)=___比特(保留一位有效数字)

    接13题,i(x;y)=___(保留四位有效数字)

    令离散无记忆信源 则s的最佳二元码相应的平均码长=____(保留三位有效数字)

    接上题,编码效率=____(保留两位有效数字)

    设离散无记忆信道输入为{0,1},输出为{0,1},信道转移概率矩阵为。则信道容量为_____比特(保留四位有效数字)

    接上题,其最佳分布为q(0)=___(保留一位有效数字)

    接19题,其最佳分布为q(1)=___(保留一位有效数字)

    时间离散的可加高斯噪声信道,若限定输入平均功率上限为1,噪声服从高斯分布n(0,1),则该信道信道容量为____比特。(保留一位有效数字)

    接上题,最佳输入分布为____分布

    什么是薄膜?

    薄膜制备方法分类。

    薄膜应用领域举例。

    简要阐述三种薄膜厚度的测试方法

    晶体振荡法测试薄膜厚度的缺点有哪些?

    真空的定义

    名词解释:饱和蒸汽压

    名词解释:分子平均自由程

    气体分子的流动状态可以分为哪几种?描述其主要特征

    真空系统由哪些构件组成?

    举例说明真空泵有哪些类型?

    饱和蒸汽压与温度的关系?

    物质的蒸发速率与哪些因素有关?

    点蒸发源和小平面蒸发源的膜厚分布特性

    对于真空蒸发镀膜,通常采取哪些方法可以获得更好的均匀性?

    阐述溅射的主要过程

    什么是溅射产额?溅射产额与哪些因素有关?

    溅射沉积的优点有哪些?

    射频溅射时,为什么不会对基片进行溅射?

    cvd原理、特点及分类

    cvd的主要反应类型有哪些?

    lpcvd工作原理及特点

    pecvd的原理、优点以及产生等离子体的主要方法

    mocvd的原理、优点

    什么是化学镀?它与电镀的主要区别什么?

    溶胶-凝胶镀膜法的特点和主要过程

    阳极氧化镀膜和电镀的原理及特点。

    什么是lb镀膜技术?lb薄膜的主要类型

    2017年,第十二届全国大学生交通科技大赛在( )举办。

    全国大学生交通科技大赛由( )发起。

    铁路道岔除雪装置除雪的基本原理是( )。

    全国大学生交通科技大赛具有( )特点。

    参加全国大学生交通科技大赛的作品,其形式包括( )。

    基于mems能量回收的智能环保公交站台系统回收的能源类型包括( )。

    一个参赛团队最好擅长以下几个方面( )。

    全国大学生交通科技大赛每两年举行一届。

    第一届全国大学生交通科技大赛于2006年举行。

    参加全国大学生交通科技大赛的小组成员最好都来自交通运输专业。

    参赛小组组长不仅要统筹规划全局,也要做一些具体工作。

    第十一届全国大学生交通科技大赛分设的竞赛小组包括。( )

    作品《道路危险品运输实时监控及应急救援系统开发》中包含的子系统有( )。

    作品《基于车联网电子车牌技术(rfid)的城市交通监控服务系统》中采用了rfid电子标签,有助于解决( )。

    产生创意的过程包括( )。

    作品《基于mems能量回收的智能保公交站台系统》在方案设计时将系统分成了( )。

    在有了创意想法之后,方案设计采用的方法主要有( )。

    一个比赛作品的核心就是创意。

    作品《基于mems能量回收的智能环保公交站台系统》的“新”在于将多种功能合为一体,能够同时满足多种要求。

    在比赛过程中,遇到所有问题都应该去找指导老师解答。

    实物类作品的实现过程包括:( )。

    全国大学生交通科技大赛作品的类型包括:( )。

    第八届全国大学生交通科技大赛作品“集装箱组合装车优化及偏载实时监控系统”实现的功能有( )。

    第十一届全国大学生交通科技大赛作品“面向旅客需求的铁路旅程规划信息系统”的实现过程包括了( )。

    在对“便携式车载太阳能换气降温系统”进行方案优化时的改动有( )。

    为了实现精美的作品展示,常用的三类形式为( )。

    一个完整的展示视频可不是一些图片以及动画就能解决的,通常需包括( )几个部分。

    在作品展示环节中,要让人有耳目一新的感觉和让人( )的感觉。

    有机械机构的作品要注重实物展示,偏向软件的系统作品则要在( )上下足功夫。

    对于比较大的系统,在制作实物时可制作( )模型。

    在网评环节,为了让别人了解自己的作品,一般需提供ppt、视频、照片和作品( )。

    在答辩过程中,可通过( )促进与评委的交流。

    软件著作权人享有的权利包括( )。

    关于论文的写作要点, 需注意( )。

    现场答辩的效果主要取决于讲解的口才。

    在答辩中多使用多媒体素材(包括图片、视频、动画等),可以提高答辩效果。

    专利的类型分为( )专利、实用新型专利、外观设计专利三种类型。

    专利申请文档主要包括权利要求书、说明书、说明书附图、说明书摘要、摘要附图五个部分,一般简称( )。

    专利文档的摘要、权利要求和说明书三部分中最重要的部分是( )。

    软件著作权属于一种( )权利

    英文期刊可分为( )检索期刊、ei检索期刊、国际学术期刊、会议论文以及一般期刊。

    一篇科技论文通常包括摘要、( )、建模分析、实验描述、实验结果讨论、结论等内容。

    全国大学生交通科技大赛具有( )特点。

    参加全国大学生交通科技大赛的作品,其形式包括( )。

    基于mems能量回收的智能环保公交站台系统回收的能源类型包括( )。

    一个参赛团队最好擅长以下几个方面( )。

    第十一届全国大学生交通科技大赛分设的竞赛小组包括:( )。

    产生创意的过程包括( )。

    在有了创意想法之后,方案设计的合理方法主要有( )。

    为了实现精美的作品展示,常用的三类形式为( )。

    一个完整的展示视频可不是一些图片以及动画就能解决的,通常需包括( )几个部分。

    在答辩过程中,可通过( )促进与评委的交流。

    软件著作权人享有的权利包括( )。

    全国大学生交通科技大赛每年举行一届。

    第一届全国大学生交通科技大赛于2008年举行。

    参加全国大学生交通科技大赛的小组成员最好不要都是交通运输专业。

    全国大学生交通科技大赛由同济大学发起的。

    参赛小组组长一般只统筹规划全局,不需要做具体工作。

    一个比赛作品的核心就是创意。

    铁路道岔除雪装置除雪的基本原理是空气伞原理。

    现场答辩的效果主要取决于讲解的口才。

    在答辩中多使用多媒体素材(包括图片、视频、动画等),可以提高答辩效果。

    在作品展示环节中,要让人有耳目一新的感觉和让人意犹未尽的感觉。

    对于比较大的系统,在制作实物时可制作缩小模型以降低成本。

    专利的类型分为发明专利和实用新型专利两种类型。

    专利文档的摘要、权利要求和说明书三部分中最重要的部分是摘要。

    软件著作权属于一种民事权利。

    生物药物分析试卷

    1. 用化学方法鉴别下列各组化合物 a. 丙醛 b. 丙酮 c. 丙醇 2. 用化学方法鉴别下列各组化合物 a. 丙胺 b. 二丙胺 c. 三丙胺 3. 为什么重氮盐与芳胺的偶合反应一般在弱酸性条件下进行? 4. 为什么吡啶的的卤代反应不使用fex3等路易斯酸作催化剂? 5. 制备环己酮时为何要注意控制反应温度,不可过热?

    why hasn’t jack goodwin got a job yet?

    how does he spend a typical day?

    how do most of his friends spend the day?

    how are jack’s parents helping him?

    what do whoopi goldberg, bruce willis and brad pitt have in common?

    in the passage if you ask me, the writer claimed that real life is not like what people normally praise it.

    she declined the offer to do an ma at the london school of economics due to a bad financial condition.

    after she got the first salary in the saliury, she bought herself a bunch of flowers.

    tony invested in the writer by giving her a 20,000-pound loan, asking a ten percent annual interest for the collateral of the money.

    using her own story, the writers elaborated that the optimal returns in the business world is given by investing in people.

    in the us, a “_______ (2 words)” approach normally shows the positive aspects of the job hunter.

    more than a quarter of british resume writers are guilty of overdoing their resume. that is, they tell ______ (1 word).

    on mainland europe, the standard format form cv can find clear and easy-to-understand, but it has not yet been ________ (2 words).

    according to the writer, the “_____ (1 word, in capital letters)” philosophy is the most useful guideline.

    the following resume is written in a ________ (1 word) order. 2008 summer job in tourist information office, bournemouth 2007 summer job as lifesaver patrolling busy beach in bournemouth 2006-2008 occasional weekend bar work in duke of monmouth pub, southampton 2005-2006 volunteer in india on a clean water project

    what is the main writing purpose of the passage danger! books may change your life?

    why are we like alice in wonderland when we read a book?

    which one is not the struggle that miller, the author of they are alive and they spoke to me, has with books?

    according to miller, what should you do when you find a book you want to read?

    why does miller especially admire about blaise cendrars?

    the author’s tone in the passage is _____.

    what kinds of books helps thomas merton find out the true meaning of life?

    what are the reading’s benefits that the author reemphasizes in the end of his writing?

    the novel thing fall apart, setting in nigeria at the end of the 19th century, is a postcolonial novel and a portrayal of culture clash.

    the clash occurs when african traditions meet the forces for change in the form of christianity, as differences in their values and beliefs create misunderstandings and conflicts.

    the leading character okonkwo is a brave warrior, and his pride of his tribe and himself ended in a tragedy.

    the novel is written in a nigerian language to “bear the weight” of okonkwo’s african experience.

    what is the meaing of "deteriorate"?

    which of the following statement about king louis xiv is wrong?

    please choose the word with different meaning.

    please choose the word with different meaning.

    blue denim jeans remained popular in the us as work clothes until the 1950s, but then became associated with ______.

    what are features of formal writing?

    when stock market goes up, women are likely to wear short skirt, i.e. lower hemline; stock market goes down, long skirt, higher hemline. this is what we call hemline index.

    why women should want to expose more or less of their legs during periods of economic boom and bust remains a mystery.

    the lipstick effect is the theory that when facing an economic crisis consumers will be more willing to buy lipstick.

    when gina cowen is looking for glass on a beach, she finds time passes slowly.

    for most of the jewellery cowen makes, she exhibits it in galleries.

    sea glass will eventually run out --- one day, it will be rarer than diamond.

    sea glass is more ecological than diamonds and gold because it can be used for a variety of purposes.

    gina cowen devoted herself to sea glass career because of her experience on a beach near cape town.

    french fashion history and french national history are closely intertwined.

    louis xiv is the one who helped put france and paris on the international fashion map

    the passage starts with "i have a confession". what rhetorical device is used here?

    if something is an asset for you, it is ______.

    if you weather a bad period, you ______.

    buddy is an informal word for _______.

    a cash cushion will _______.

    which of the following country is not in the urozone?

    which sort of clients do credit card companies want?

    what are synonyms of the phrase "go from bad to worse"?

    which is (are) the synonym(s) of mutual?

    kelly failed to continue her studies in university because of credit card.

    the three phrases: prone to, liable to and subject to can indicate likelihood.

    euro coins only have symbols of the country which issued the coins.

    euro banknotes illustrate gateways and windows and bridges, designed to show major architectural periods.

    the european parliament is elected every three years by eu citizens.

    renaissance architecture is the architecture of the period between the early 15th and early 17th centuries.

    what is the unmarked clothing style for men?

    what does a marked female ending to a word usually convey?

    emmy awards are for ______.

    which of the following words is marked?

    which of the following does not belong to traditional stereotypes of women?

    what are the author’s main purposes of writing this passage entitled sex differences in english gossip rules?

    men gossip just as much as women.

    men talk more about politics than women.

    men talk more about football than women.

    women talk more about themselves than men.

    men don’t admit they gossip.

    women don’t admit they gossip.

    if a woman wears no make-up, she is unmarked.

    in western tradition, women will take her huand’s family name after marriage.

    “dr.” is an unmarked title for women.

    in the summer of 1940, britain ______.

    churchill suggested that britain ______.

    winston’s father thought he was _____.

    the writer suggests that churchill's early ambition was _____.

    winston fought as an ordinary soldier because _____.

    what is not an auxuliary science of history?

    what is the most important factor for a basic fact to become a historical fact?

    what is a priori argument?

    which of the following statement has the same meaning as "the facts speak only when the historian calls on them"?

    traditional and living history museums are the two types of museums.

    people can experience life of someone in the iron age 2,000 years ago.

    visitors gain a real insight into the skills of the ancient people by living in the roundhouses in cinderbury.

    cinderbury is special because the whole city is a living museum.

    in the writer's opinion, living history museums are much more interesting than traditional museums.

    there was a ________ of colors, from blossom in early spring to the dark golden colors of late autumn.

    the baby___________ with pleasure.

    what is the meaning of the word “cease”?

    our homes also show our inidual sides, through _____________________.

    what are synonyms of the phrase "immense"?

    in active reading two golden memories, the author tells the story between him and his house.

    in active reading two golden memories,personification is used in the writing.

    the golden memories of the house imply changes of the times.

    women's traditional roles have been swept away, and how they now exercise their birthright of greater choice.

    so can the home, as we know it, survive? (in para.7 active reading one). this is a rhetorical question.

    on average, british people pay half of their income for accommodation.

    council houses were built and provided freely to primarily working-class people.

    in u.k., grandparents usually live in their own homes.

    british people seldom move home in their lifetime.

    the national health service (nhs), which was established in 1948, provides (almost) free healthcare to those who cannot afford it.

    choose the best summary of the passage.

    the main idea of the passage is that ______.

    the writer compares architecture to language to show that ______.

    the main problem with the blocks of flats in britain built in the 1960s and 1970s was that ______.

    the writer says that the rockefeller center ______.

    replace "breathtaking" with a combination of a degree adverb adjective.

    replace "soaring" with a combination of a degree adverb adjective.

    replace "exquisite" with a combination of a degree adverb adjective.

    which are the distinctive aspects of santa fe’s architecture?

    in what ways are chinese and western architectures different in terms of human cultures?

    filling the blanks with the words: resounding demountable utilitarian; lofty transcend the internet is delivering more and more useful, ______ options.

    filling the blanks with the words in the box. resounding demountable utilitarian lofty transcend what brings us together is that we have common interests which those _______ differences.

    filling the blanks with the words: resounding demountable utilitarian; lofty transcend the structure of the home shopping cart adopted"______ design" and the recycle materials, which showed the"green design" concept.

    filling the blanks with the words in the box. resounding demountable utilitarian; lofty transcend asia has become a region with dynamic development and great potential and plays an increasingly important role in promoting the _____ undertaking of peace and development of human being.

    the writer is studying chinese ______.

    the dominance of english is probably going to decline in the future because ______.

    chinese dictionaries are difficult for the writer to use because ______.

    the writer is frustrated by chinese tones because ______.

    the writer compares learning chinese to doing a crossword puzzle ______.

    what does the writer say about the state of civilization today?

    what point is the writer making about the word syllabus?

    what does the writer imply about people today who can spell well?

    what does the writer say about the czech language?

    why have movements to reform spelling not been successful?

    confucius institutes are non-profit public institutions that aim to promote chinese language and culture and support local chinese teaching internationally.

    pictograms make up a large portion of chinese characters. characters in this class derive from pictures of the objects they denote.

    a large unabridged dictionary, like the kangxi dictionary, contains over 40,000 characters, including obscure, variant, rare, and archaic characters; less than a quarter of these characters are now commonly used.

    a large portion of the modern english vocabulary came from the anglo-saxon languages.

    old english initially was a erse group of dialects, reflecting the varied origins of the anglo-saxon kingdoms of britain.

    what is true about lines of longitude?

    what was the importance of ptolemy to navigation?

    what is the function of the prime meridian?

    which of the following cannot help a sailor determine latitude?

    what did christopher columbus use for navigation?

    what does one need to accurately determine the longitude while at sea?

    how many miles does a ship sail to cover 15 degrees of longitude?

    why did the great captains of the age of exploration get lost at sea?

    what benefits to china can be achieved by exploring space?

    which of the following statements are true?

    which of the following novels are written by jack london?

    anyone above the equator would melt into deformity from the horrible heat.

    neil alden armstrong was an american astronaut and the first person to walk on the moon.

    christopher columbus was an explorer, colonizer, and navigator.

    the apollo 11 mission was the first time people had been on the moon.

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