变压器接线组别的“时钟’表示法,就是把高压侧相电压()的相量作为(),而把低压侧相电

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问题:

变压器接线组别的“时钟’表示法,就是把高压侧相电压()的相量作为(),而把低压侧相电压()的相量作为(),然后把高压侧相电压()的相量固定在12点上,则低压侧电压()的相量所指示的钟点,就是该自变压器的接线组别。

考点:集控值班员考试电气运行电气运行题库
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假设一位宋代的商人到开封做生意,他的活动不可能出现哪种情况

A.在居住区开绸缎店

B.在市场上买卖茶叶、甘蔗

C.让手下从各地集市搜罗地方特产到开封贩卖

D.生意活动要接受专门管理机构的监督管理

题型:填空题

有关汽车尾气对人体的危害说法不正确的是()。

A.CO被人体大量吸入后会使人感觉恶心、头晕及疲劳,严重时会使人窒息死亡

B.碳氢化合物对人的眼、鼻和咽喉粘膜有较强的刺激作用,严重时可致癌

C.NO2是一种刺激性很强的污染物,它能刺激眼、鼻粘膜,麻痹嗅觉

D.汽车尾气中直接排出的氮氧化物基本上是NO2

题型:填空题
Do you know what kind of things the young people are reading? More and more  36  and parents have noticed another kind of pollution, which comes from the printed papers  37  on streets.
  These printed things 38  newspapers but have hardly anything to do with 39 . You can only find reading materials badly made up there---some are too strange for anyone to 40 ,  others are frightening stories of something  41  .However, many of the young readers are getting interested in such  42  reading, which  43 them what they should pay for their breakfast and brings them nightmares(噩梦)and immoral(邪恶)ideas in  44 .  Homework is left  45 ,  and daily games are lost.
  These sellers shout on streets selling their papers well. The writers, publishers and printers,  46  they are, we never know,  are  47 their silent money.
The sheep-skinned wolf’s story seems to have been forgotten once again .Why not 48 this kind of thing? Yes, both teachers and parents have asked each other for more strict control of the young readers.  49  ,the more you want to forbid it, the more they want to have a look at it. 50  you may even find  several children, driven by the curious natures,  51  one patched paper,  which has travelled from hand to hand.
  It really does 52  to our society. It has already formed a sort of moral pollution. The  53  teachers and parents need more powerful support in their protection of the young generation. At the same time the young 54  need more interesting books to help them  55  those ugly papers.
小题1:
A.teachers  B.writers  C.readers   D.students
小题2:
A.found   B.soldC.printed   D.put
小题3:
A.depend on B.work outC.look like  D.act as
小题4:
A.it  B.themC.children  D.young people
小题5:
A.understand B.think   C.believe  D.know
小题6:
A.more importantB.still worseC.even betterD.very good
小题7:
A.poisonous  B.wonderfulC.interesting D.useful
小题8:
A.takes    B.spendsC.paysD.costs
小题9:
A.use    B.sightC.common  D.return
小题10:
A.undone   B.unknownC.much    D.less
小题11:
A.who    B.whatC.whoeverD.whatever
小题12:
A.using   B.making C.spending  D.wasting
小题13:
A.stop    B.forbidC.separate   D.leave
小题14:
A.Happily  B.LuckilyC.UnfortunatelyD.Badly
小题15:
A.Seldom   B.AlwaysC.Hardly   D.Sometimes
小题16:
A.take    B.shareC.get  D.hold
小题17:
A.harm    B.goodC.favorD.wrong
小题18:
A.worried   B.puzzledC.surprised  D.disappointed
小题19:
A.writers   B.teachersC.parents   D.readers
小题20:
A.get off   B.come intoC.break down D.get rid of
题型:填空题

下列说法中错误的是(  )

A.L层电子为偶数的所有主族元素所在族的序数与该元素原子的L层电子数相等

B.元素周期表中从ⅢB到ⅡB族10个纵行的元素都是金属元素

C.除氦外的稀有气体原子的最外层电子数都是8

D.同一元素的各种同位素的化学性质几乎相同

题型:填空题

若将散热器沿垂直方向分成若干级,每组()层,在每组内采用双管形式,而组与组之间则采用单管连接,这样就组成了单双管混合式系统。

A.1~2

B.2~3

C.3~4

D.4~5

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