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    which of the following descriptions about metaboli are true

    the false statement about the 2, 3-bpg shunt pathway is

    the key enzymes of glycolysis pathway include

    the energy in mature red blood cells come from

    which of the following about physiological roles of glycolysis are true

    the strongest allosteric activator of phosphofructokinase-1 is

    cofactors of the pyruvate dehydrogenase complex include

    the false statement about the citric acid cycle is

    the key enzymes in citric acid cycle include

    the false description about physiological roles of citric acid cycle is

    the important products generated by pentose phosphate pathway are

    the active glucose donor for synthesis of glycogen is

    degradation of liver glycogen can directly supply blood glucose because liver contains

    which of the following about regulation of glycogen synthesis and degradation are true

    the key enzymes in gluconeogenesis include

    the false statement about physiological significances of gluconeogenesis is

    glucose may be produced from

    the hormone that lower blood glucose level is

    the sources of blood glucose include

    under starvation(饥饿), liver involves in regulation of blood glucose mainly through

    the enzyme required for the reverse reaction catalyzed by hexokinase is

    under anaerobic condition, the metabolic fate of nadh h generated in glycolysis pathway is

    the end product of aerobic oxidation of glucose is

    the biochemical mechani of hemolytic anemia caused by deficiency of glucose-6-phosphate dehydrogenase is

    under resting state, most of the blood glucose can be used by the following tissue/organ

    the energy in mature red blood cells come from

    the product(s) of acetyl coa oxidized by citric acid cycle is/are

    the deficient enzyme in patients with hemolytic jaundice caused by eating fresh broad beans is

    which of the following description about glycogen phosphorylase is false

    the end product of anaerobic glycolysis in human cells is

    the most important key enzyme that regulates the glycolysis is

    the reason why muscle glycogen breakdown cannot directly replenish blood glucose is

    the hormone that inhibit gluconeogenesis is

    the high energy compound directly generated by substrate level phosphorylation in the tricarboxylic acid cycle is

    the citric acid cycle occurs in

    cofactors of the pyruvate dehydrogenase complex include

    the correct descriptions about glycogen synthase are

    the raw materials for gluconeogenesis include

    under starvation (饥饿), liver involves in regulation of blood glucose mainly through

    the important products generated by pentose phosphate pathway are

    the key enzymes in citric acid cycle include

    the metabolic fates that g-6-p involve in include

    the enzymes that catalyze the irreversible reactions of the citric acid cycle are

    the enzymes required for hepatic glycogenolysis include

    which of the following components does the lipoid include?

    which of the following are essential fatty acids for human beings?

    which one is produced by the pancreas and involved in the digestion of triglycerides, but does not have the hydrolase activity?

    the cofactor of acetyl coa carboxylase is

    the rate-limiting enzyme for fatty acid oxidation is

    which of the following tissue cells cannot use ketone bodies?

    the metabolic pathways of cholesterol in the human body include

    which of the following plaa lipoprotein gets most of cholesterol?

    which of the following apolipoproteins can directly activate lpl?

    the patient was found that plaa vldl and triglycerides increased significantly. which one should be considered first in the following diseases?

    the bulk of the fat stored in the body comes from

    which one of the following that can bind and transport of free fatty acids in blood is

    the tissue that cannot oxidize fatty acids is

    during long term starvation, the energy in brain mainly come from

    the wrong statement about ketone bodies is

    the correct statement about fatty acid biosynthesis is

    the reducing equivalents for synthesis of fatty acids and cholesterol mainly come from

    the substance that cannot be converted to acetyl coa is

    the key enzyme in cholesterol synthesis is

    the main metabolic fate of cholesterol is transformed into

    the cause of familial hypercholesterolemia is

    the apolipoprotein involved in the recognition of ldl receptor is

    in liver, acetyl coa can be used to synthesize

    the tissue cells that can oxidize ketone bodies include

    the correct statements about apolipoprotein function are

    which of the followings involve in the reverse transport of cholesterol

    apo b exists in

    cholesterol can be converted into

    synthesis of fatty acids from acetyl coa

    ketone bodies are pathological metabolites that are not produced under normal conditions.

    the active donor of diacylglycerol in phospholipid synthesis is udp- diacylglycerol.

    concerning the description of biological oxidation, which one is wrong?

    which of the following compound is not a component of respiratory chain ?

    regarding the description of iron-sulfur protein, which one is not correct?

    which of the following coenzymes transfer electrons and hydrogen atoms at the same time?

    the characteristics of cytc are

    which description do not conform to the chemiootic hypothesis viewpoint?

    the centre molecule of energy generation and usage in human body is

    the main storage form of high-energy phosphate in muscle

    cyanide(氰化物) can inhibit

    for oxidative phosphorylation, dinitrophenol (dnp) is

    the statement about monooxygenase, which one is incorrect?

    the molecule at the center of energy production and utilization in human body is

    the main way of atp production in the body is

    the oxidative respiratory chain of eukaryotic cells exists in the

    the description about respiratory chain, which one is correct?

    which one of the followings is not the component of mitochondrial respiratory chain ?

    electrons from pyruvate enter the respiratory chain through

    the carrier that can transfer electrons directly to oxygen in respiratory chain is

    the sequence of electrons transferred in the cytochromes is

    which description about mechani of atp synthesis is correct?

    co can cause cellular respiratory arrest, the mechani is

    the most important factor that regulates oxidative phosphorylation is

    in the following statements about the chemoosis hypothesis and mechani of atp synthesis, which one is incorrect?

    which statement about mitochondrial dna (mtdna) is wrong?

    which of the following statements about the respiratory chain is incorrect ?

    the metabolic fates of nadh h produced in glycolysis are

    the characteristics of biological oxidation include

    metabolic reactions that occur in mitochondria include

    coenzymes that transfer both hydrogen and electrons are

    compounds containing high energy bonds are

    the nadh produced in cytopla are transferred to mitochondria for oxidation by

    please describe the ways that atps are produced in human body.

    the following description about nitrogen balance,which one is wrong ?

    which of the following proteolytic enzymes are secreted by the pancreas?

    which one is wrong about the statement of protein putrefaction?

    the products of protein putrefaction include

    which one is right about the descriptions of lysosome degradation pathway?

    which one is wrong about the description of transamination?

    the major fate of blood ammonia is

    the sources of blood ammonia include

    the transportation form of ammonia in blood are

    in urea cycle,the reactions takes place in mitochondria are

    the key enzymes of urea cycle are

    the coenayme of l-glu decarboxylase is

    the amine that is high in cancer tissues is

    the carrier of one carbon unit is

    which of the following descriptions about one carbon unit are right?

    which of the following biosynthetic processes are independent of sam?

    the reasons of megaloblastic anemia is due to

    pku is due to the deficiency

    the amino acids that can be converted into catecholamines include

    the end products of protein cataboli in the body include

    the coenzyme of transaminase is

    the major organ for urea synthesis is

    which vitamin is involved in the composition of the coenzyme of transaminase?

    which one of the following is the direct doner of active methyl group in body?

    which intermediate of citric acid cycle is depleted in brain of the patients with hyperammonemia?

    which enzyme deficiency can cause pku?

    which amino acid is involved in the synthesis of serotonin (5-ht)?

    which enzyme deficiency can cause albini disease?

    which one of the following amino acids can be converted to taurine?

    the active sulfate in the body is

    which one of the following vitamins is involved in the met cycle?

    one carbon unit include

    urea cycle takes place in

    the reasons of megaloblastic anemia is

    the major transport forms of ammonia in blood are

    tyrosine can be converted into

    the metabolic pathways of α-keto acid produced by amino acid deamination are

    sam can be used to synthesize

    co2 contains one carbon atom, so it belongs to one carbon unit.

    the carrier of one carbon unit in the body is folate.

    infants, pregnant women and convalescent patients with adequate nutrition are in the state of nitrogen balance.

    one carbon unit in the body can be converted to each other.

    which of the following statements about 2,3-bpg is true?

    which statement of heme synthesis are correct?

    the main pathway for mature red blood cells to gain energy is

    the main role of nadph h produced in mature red blood cells is

    in hematopoietic cells(造血细胞), the site of heme synthesis is

    the rate-limiting enzyme for heme synthesis is

    the rate limiting step in heme synthesis is

    the coenzyme of ala synthase is

    the function of 2,3-bpg in red blood cells is

    the antioxidants in red blood cells are mainly

    the factors that affect heme synthesis are

    the materials for heme synthesis include

    the factors that affect ala synthase are

    the characteristics of heme synthesis are

    the functions of atp in erythrocytes are

    which of the following description about the metabolic features of mature red blood cell are correct

    the metabolic pathways in mature red blood cells include

    which one of the following descriptions of biotransformation is wrong

    the most important phase ii reaction of biotransformation is

    factors influencing biotransformation include

    primary bile acids include

    the rate-limiting enzyme for bile acid synthesis is

    the false statement about bile salts is

    which statement of unconjugated bilirubin are correct?

    the most important oxidase in hepatocyte microsomes is

    the highest content of organic components in bile is

    the bilirubin mainly comes from

    the protein that binds to bilirubin for transportation in the blood is

    conjugated bilirubin refers to a complex of bilirubin that binds to

    which of the following substances is secondary bile acids

    which of the following description about unconjugated bilirubin is wrong

    which of the following description about conjugated bilirubin is wrong

    the substance that bilirubin is converted directly into in the intestine is

    the pathway through which bile pigment is produced, transported and excreted is

    which of the following description about bile acids is wrong

    the reactions of biotransformation don’t include

    the most important organ for human biotransformation is

    most of the objects of biotransformation is

    the significances of biotransformation

    the bile pigment that can enter enterohepatic circulation is

    under normal conditions, the main pigment in human feces is

    the phase 1 reactions of biotransformation include

    the significances of biotransformation are

    the phase 2 reactions of biotransformation include

    water soluble bile pigments include

    the factors affecting biotransformation are

    the group donors involved in phase 2 reactions of biotransformation include

    bile pigments include

    in hepatocyte jaundice, the changes in bile pigment metaboli are

    the bile pigment can be generated from

    the features of free bilirubin are

    in obstructive jaundice, the changes in bile pigment metaboli include

    bilirubin is transported in the blood in combination with albumin, so it is called conjugated bilirubin.

    the stool of patients with obstructive jaundice can be white clay.

    国际奥委会成立于( )。

    5w传播模式的提出者是( )。

    学者劳伦斯·温勒尔主编的著作是( )。

    体育传播学也可以称为体育新闻传播学。

    标志着体育新闻从原始的人际传播转化为正式的媒介传播的世界上最早的官报是( )。

    第一项由电视定期转播的运动项目是( )。

    体育传播的形式有( )。

    体育传播的功能有( )。

    符号和意义合为一体构成了信息。

    “三网融合”指的是( )。

    媒介包含的意义指( )。

    体育传播者包括( )。

    广播的主要传播符号有( )。

    受众在传播过程中同样是一个主动的传播角色。

    体育建筑属于传播意义上的静态语言符号。

    撰写一份体育传播活动中新媒体使用情况调查报告。

    学校体育课属于( )。

    奥运会转播权费用节节攀升主要是缘于( )。

    人内传播又称为( )。

    1992年1月1日电视台体育频道(cctv-5)正式开播。

    世界杯赛期间,观众人数较平时呈现“井喷”现象,这表现了受众的( )

    根据关注体育传播的程度不同,受众可分为( )。

    体育传播中受众的基本心理需求有( )。

    自选受众类型,调查他们的体育信息需求。

    提出传播学议程设置理论的学者是( )。

    提出传播学培养理论的学者是( )。

    选择身边的某项赛事,撰写一份赛事评估报告。

    历史上第一部体育法是( )

    体育传播人文环境因素包括( )。

    政治需要决定体育传播的目的和性质。

    体育产业发展水平与经济发展水平无关。

    2008年北京奥运会的理念是( )。

    奥林匹克格言是“重在参与”。

    谈谈你对体育传播学这门学科的理解。

    移动互联技术的发展将会对体育传播产生哪些影响?

    广义的德育除了道德教育,还包括 。

    如何理解中西方文化差异下德育内涵的差异?对我们有何启示?

    教育要使人成为人 ,是人性的觉醒和教育回归。

    为了生命的道德教育只有在生活中才能找到其存在的基础和强大生命力。

    德育的理论基础有哪些?它们之于德育研究的意义何在?

    持“道德虚无主义”观点的是

    持“道德天赋论”观点的是

    “不必强求人人有一样的口味那样,也不必强求人人有一样的道德”,这种观点属于

    “美德即知识”这一著名命题的提出者是

    评述对学校道德职能夸大和低估的两种截然不同观点

    德育功能从作用对象上可分为

    提出的“以德治国”的观点,这体现了德育的

    “君子喻于义,小人喻于利”,这句话体现了德育的

    提出正功能与负功能的人是__。

    “君子坦荡荡,小人常戚戚”这句话体现了德育的__功能。

    谈谈树立正确德育功能观的重要实践意义。

    如何理解德育诸功能之间的关系?

    持个人本位德育目的论观点的人是

    持社会本位德育目的论观点的人是

    试评述个人本位的德育目的论和社会本位的德育目的论。

    德育的一般过程中,_____ 是基础,行是关键。

    德育过程和思想品德形成过程是______ 和发展的关系。

    教师如何构建理想的师生关系?

    道德法则具有浓厚的等级色彩的社会是

    按照课程的形态划分,德育课程一般可分为

    按照课程的存在方式划分,德育课程可分为

    以学生的兴趣、需要和能力为基础,通过学生们一系列的自主性活动而实施的德育课程称为

    如何设计和组织活动德育课程?

    “教也者,长善而救其失者也”,体现的德育原则是

    提出平行教育原则的人是

    苏霍姆林斯基说 “让每个学生都抬起头来走路”体现的德育原则是

    我国德育的基本方法是

    运用别人的高尚思想、模范行为、优秀品质和卓有成就来影响、教育学生的德育方法是

    联系实际谈谈如何运用“尊重学生与严格要求相结合”的德育原则。

    德育模式的基本特征

    论述课堂教学中利用冲突事件实施价值观教育的基本要求。

    在家庭教育环中,最重要的是什么?

    学校环境通常由物质环境、制度环境、文化环境和( )组成。

    我国二胎政策放开之后,会对家庭的( )环境产生直接重要的影响?

    从德育的角度看,社会环境主要包括经济环境、政治环境、文化环境和( )。

    谈谈学校文化环境的含义及如何推进学校的文化环境建设?

    谈谈网络环境对德育的影响,应该如何建设健康的网络环境?

    “美德即知识”。把美德当做知识进行传授,是知性德育的最早源头。

    生活是德育生活化的根基。

    论述课堂教学中,依托生成事件对学生进行价值观教育,对教师的基本要求。

    论述教育学与现象学视野里“生活”内涵的差异。

    当前道德教育中突出问题有哪些,你认为应该如何解决?

    选出主视图绘制正确的一组

    选择主视图绘制正确的一组

    下面各图中,主视图绘制正确的是()

    找出左视图绘制正确的一组()

    视图通常包含哪几种视图?

    下列说确的是()

    将机件的某一部分向任意投影面投影得到的视图都叫做局部视图。

    由于剖视图是假象将机件剖开后再投射,而实际机件是完整的,因此其它图形应按完整的机件画出。

    下图所示的a向视图是局部视图。

    选出主视图绘制正确的一组

    选出半剖视图绘制正确的一组

    当对称机件的轮廓线与对称中心线重合,应采用哪种视图?

    a-a断面图中,绘制正确的是

    选择正确的重合断面图

    已知机件的主视图和俯视图,请选择正确的主视图的剖视表达()

    下图中的左视图采用的是()

    下面4组图形中,表达正确的一组是()

    外螺纹画法中,绘制正确的一组是

    内螺纹画法中,绘制正确的一组是

    找出内外螺纹旋合画确的一组

    标注螺纹时,下列说确的是()

    管螺纹的公称直径是指()

    当两个被连接件不太厚时,宜采用()

    螺纹要素中除了螺纹牙型以外,还包括以下哪几个要素?

    下列螺柱连接、螺钉连接绘制正确的是()

    内外螺纹旋合时,螺纹牙型、公称直径、螺距、线数必须一致,旋向一定相反。

    普通螺纹、管螺纹、梯形螺纹、锯齿形螺纹、矩形螺纹都是标准螺纹。

    下图图形中,尺寸标注正确的是

    对于标准直齿圆柱齿轮,下列说确的是

    下图中普通平键连接画确的是()

    常用的齿轮传动有

    下图中单个直齿圆柱齿轮画法、两直齿圆柱齿轮啮合画法中正确的有()

    单个齿轮的规定画法中,轮齿部分不画剖面线。

    常用的销有圆柱销、圆锥销和开口销等,它们都是标准件。

    平键连接中,平键的两个侧面是工作表面。

    下图中所给的三个方向中,哪个方向作为主视图的投影方向比较理想

    轴套类零件的加工,大部分工序是在车床或磨床上进行,因此一般将其轴线()放置画出主视图。

    对零件进行尺寸标注时,是否可以注成封闭尺寸链()

    一张完整的零件图应包含哪些内容?

    关于下图说确的有()

    下列图形中,铸件壁厚合理的是()

    比较a、b两图中的尺寸标注,合理的尺寸标注是()

    下图钻孔结构中,不正确的是

    下图中,轴肩结构正确的是()

    表面质量要求越高,则( )

    当孔的公差带完全在轴的公差带之上时,属于( )配合。

    表面粗糙度中,ra值等于()

    下图中h8表示()

    粗糙度符号可以标注在可见轮廓线、尺寸线、尺寸界线或它们的延长线上。

    h6/f5是基轴制配合。

    下图所示,两零件之间的配合属于基轴制过渡配合。

    公称尺寸相同,相互结合的孔和轴公差带之间的关系成为配合。

    下面装配图中的1号件,属于哪一类零件?

    装配图的视图选择的步骤是( )

    同一个方向上两零件有( )个接触面或配合面

    下图中,图中的m52x2表示()

    下图俯视图中的结构,表示()

    一张完整的装配图应包含哪些内容

    从下图中,选出带有螺纹结构的零件()

    读如下装配图,回答:该机器中由()个不同零件组成。(请填写数字)

    下图中,()号零件是非金属材料。(请用数字填写零件序号)

    的含义说确的是()

    下列常见装配结构中正确的是()

    读零件图,选出底板上圆柱孔正确的定位尺寸()

    读零件图,找出该零件图中有几处螺纹结构()

    普通平键连接图绘制正确的是()

    内外螺纹旋合画法绘制正确的是()

    下面a-a断面图中,绘制正确的是()

    根据下图绘制的b-b断面图正确的是()

    零件图可以表示零件的( )

    对薄片零件、细丝弹簧和微小间隙等,若按其实际尺寸在装配图上很难画出或难以明显表示时,可采用()画法。

    读安全阀装配图,回答:6号件阀体属于下列()类零件。

    下面装配图中,如果要拆画6号件阀体,主视图应该()

    下面齿轮啮合图中绘制正确的是()

    中h8的含义说确的有()

    剖视图的种类包括()

    下图中,主视图采用的是()

    读安全阀装配图,找出关于图中说确的是()

    明细栏一般配置在装配图中标题栏的上方,按由下而上的顺序填写零件序号。

    中的表示滚花结构。

    无论哪种断面图,外轮廓线都用粗实线绘制。

    管螺纹g 1/2 a中的1/2 表示的是螺纹大径。

    螺栓连接用于两个较厚零件的连接。

    常用的销有圆柱销、圆锥销和开口销等,它们都是标准件。

    退刀槽和砂轮越程槽可按“槽宽×直径”的形式标注。

    零件图中所采用的视图、剖视图、断面图等图样画法在装配图中同样适用。

    系统发生故障时继电保护装置的任务是( )

    继电保护装置中,实现判断是否有故障发生功能的是( )

    主保护或断路器拒动时,用来切除故障的保护是( )

    对继电保护的基本要求有( )

    继电保护动作具有选择性其包含的含义为( )

    当系统发生故障时,正确地切断离故障点最近的断路器,是继电保护的灵敏性的体现。

    保护装置的动作时间就是故障切除时间。

    能满足系统稳定及设备安全要求,能以最快速度有选择地切除被保护设备和线路故障的保护称为主保护。

    继电保护装置是保证电力元件安全运行的基本装备,任何电力元件不得在无保护的状态下运行。

    系统发生不正常运行状态时,继电保护不需要跳闸但需要给出信号。

    继电器按其结构形式分类,目前主要有( )

    一般( )保护是依靠动作值来保证选择性。

    当限时电流速断保护灵敏度不满足要求时,应首先考虑( )

    电流保护采用不完全星形接线方式,当遇有y,d11接线变压器时,应在保护的中线上再接一个继电器,其作用是为了提高保护的( )

    线路上发生ab两相相间短路,过流保护采用两相星型接线方式,此时启动的继电器有( )

    以下属于继电保护整定计算内容的有( )。

    定时限过电流保护的动作电流应满足( )

    电流保护的动作值是指能让装置动作的最小值。

    电流继电器的返回系数应小于1。

    在最大运行方式下,电流保护的保护区大于最小运行方式下的保护区。

    根据最大运行方式计算的短路电流来检验继电保护的灵敏度。

    过电流保护的三相三继电器的完全星形连接方式,能反应各种相间和单相接地短路。

    过电流保护按照阶梯性规律来整定时限,主要的为了保证保护的可靠性。

    相间短路保护功率方向继电器采用90°接线的目的是( )

    在中性点不接地系统中发生单相接地故障时,流过非故障线路始端的零序电流( )

    中性点经消弧线圈接地的小电流接地系统中,消弧线圈采用( )方式。

    零序电流保护具有( )特点。

    方向性电流保护的动作条件包括( )

    在电网中装设带有方向元件的过流保护是为了保证动作的灵敏性。

    在大电流接地系统中,线路的相间电流保护比零序电流保护的灵敏度高。

    在大接地电流系统中,发生接地故障的线路,其电源端零序功率的方向与正序功率的方向正好相反。

    在大接地电流系统中,故障线路零序功率的方向是由母线流向线路。

    一般在小电流接地系统中发生单相接地故障时,保护装置应动作,使断路器跳闸。

    小接地系统发生单相接地时,故障相电压为0,非故障相电压上升为线电压。

    在中性点不接地系统中,发生单相接地故障时,流过故障线路始端的零序电流滞后零序电压90º。

    电力系统发生接地短路时,保护安装处距故障点越近,零序电压越高。

    距离保护装置的动作阻抗是指能使阻抗继器动作的( )

    影响距离保护正确动作的分支系数与网络接线方式有关,其值( )

    加到阻抗继电器的电压电流的比值是该继电器的( )

    保护线路发生三相短路,相间距离保护感受的阻抗( )接地距离保护感受的阻抗。

    具有相同的整定值的阻抗继电器,受系统振荡影响最大的是( )

    相间距离保护测量组件一般均采用( )接线方式。

    单侧电源供电系统短路点的过渡电阻对距离保护的影响是( )

    方向阻抗继电器中,记忆回路的作用是( )

    以下属于距离保护的组成元件有( )

    相对于电流保护,距离保护的优点有( )

    距离保护就是反应故障点至保护安装处的距离,并根据距离的远近而确定动作时间的一种保护装置。

    保护安装处到整定点之间的阻抗为整定阻抗。

    助增电流的存在,使距离保护的测量阻抗减小,保护范围增大。

    距离保护中的振荡闭锁装置,是在系统发生振荡时,才起动去闭锁保护。

    当距离保护突然失去电压,只要闭锁回路动作不失灵,距离保护就不会产生误动。

    距离保护的主保护应为瞬时速断保护。

    电力网中出现短路故障时,过渡电阻的存在,对距离保护装置有一定的影响,当整定值越小时,它的影响越大。

    电力网中出现短路故障时,故障点离保护安装处越远时,过渡电阻的影响也越大。

    动作时间大于振荡周期的距离保护亦应经振荡闭锁控制。

    距离保护反应阻抗减小而动作的保护,属于欠量保护。

    下列能实现线路全长速动的保护是( )

    高频方向保护是利用高频信号比较被保护线路两端的( )

    纵联保护电力载波高频通道用( )方式来传送被保护线路两侧的比较信号。

    高频阻波器能起到( )的作用。

    纵差动保护稳态情况下的不平衡电流产生原因是( )

    高频闭锁方向保护发信机起动后当判断为外部故障时( )。

    以下属于纵联保护按通道类型分类的有()

    对于高频闭锁式保护,如果由于某种原因使高频通道不通,则( )

    高频保护通道传送的信号按其作用的不同,可分为跳闸信号、允许信号和闭锁信号三类。

    高频保护优点是无时限从被保护线路两侧切除各种故障。

    高频保护不反映被保护线路以外的故障,所以不能作为下一段线路的后备保护。

    结合滤波器和耦合电容器组成的带通滤波器对50周工频应呈现极大的衰耗,以阻止工频串入高频装置。

    阻止高频信号由通道方向穿越至相邻区间

    对于闭锁式高频保护,收不到信号是跳闸的充分必要条件。

    单侧电源线路自动重合闸装置必须在故障切除后,经一定时间间隔才允许合闸,这是因为( )

    高压输电线路的故障,绝大部分是( )

    当双侧电源线路两侧重合闸均只投入检查同期方式时,将造成( )

    下列故障中( )属于瞬时性故障。

    线路采用自动重合闸装置,其作用有( )

    重合闸可由保护动作或开关位置不对应起动。

    重合闸可由保护动作或开关位置不对应起动。

    单相重合闸是指线路上发生单相接地故障时,保护动作只跳开故障相的开关并单相重合;当单相重合不成功或多相故障时,保护动作跳开三相开关,不再进行重合。

    对于采用检无压及检同期重合闸的线路,线路故障两侧跳开后,采用检同期重合侧断路器先合闸。

    双侧电源的单回线路,投检查无压一侧也同时投入检查同步继电器,两者的触点串联工作。

    气体(瓦斯)保护是变压器的( )

    调整电力变压器分接头,会在其差动回路中引起不平衡电流的增大,解决方法为( )

    变压器励磁涌流可达变压器额定电流的( )

    变压器需同时装设( )共同作为变压器的主保护。

    常用的变压器相间短路的后备保护有( )

    变压器差动保护防止励磁涌流影响的措施有( )

    变压器异常运行包括( )

    变压器差动保护继电器采用比率制动式,可以( )

    变压器发生内部故障时的主保护是差动保护。

    变压器的励磁涌流中包含大量的高次谐波,主要是3次谐波。

    复合电压闭锁过流保护中复合电压元件由负序电压和低电压两部份元件组成。

    发电机的不正常运行状态有哪些( )

    由反应基波零序电压和利用三次谐波电压构成的100%定子接地保护,其基波零序电压元件的保护范围是( )

    纵差保护可以反映发电机定子绕组相间短路。

    纵差保护不能反映所有发电机定子绕组匝间短路。

    完全电流差动母线保护,连接在母线上所有元件应装设具有( )的电流互感器。

    断路器失灵保护是( )

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