起动列车前,必须()及其以上确认行车凭证、发车信号显示正确。A、司机 B、学习司机

题型:单项选择题

问题:

起动列车前,必须()及其以上确认行车凭证、发车信号显示正确。

A、司机

B、学习司机

C、二人

D、添乘干部

考点:电力机车司机考试高级电力机车司机高级电力机车司机题库
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Weight(体重)is one of the taboo subjects. In America, it is OK, or even good, to be thin but it is an embarrassment(尴尬) to be overweight. In fact, the thinner you are, the more beautiful you are thought to be. You’ll find that most models(模特) are nothing more than skin and bones. A woman who is thin is easy to become popular. Of course, there are lots of people do their best to be thin. They may use all kinds of ways, such as doing exercise, or dieting(节食). But, sometimes, dieting may bring about some healthy problems.

Many girls want to be thin because they want to be models.
[A] Right. [B] Wrong.[C] Doesn’t say.

Americans are very careful about their weight and most of the time they do not tell others how much they weigh even if they are quite thin. Therefore, you’d better not ask about it. But if you really want to talk about this subject, it’s always safer to say, "Oh, it looks like you have lost weight. " However, if you would like to be honest and polite, I suggest that you should choose your words carefully, perhaps by saying:"Hey, you look great. Very healthy looking. " And always remember, you can not use the word "fat".

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在x轴上有两个点电荷Q1、Q2分别固定在x=0和x=6cm的位置上,其中Q1=+4.0×10-8C, Q2=-1.0×10-8C,用E1、E2表示这两个点电荷所产生的场强的大小,则在x轴上,其中x=__  __cm处的合场强为零,合场强方向沿x正方向的区域是              

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探伤作业前,37°探头的对应通道应能发现螺栓孔长4mm的斜裂纹(人工缺陷),并且当波幅为满幅高的80%时,仪器应无杂波并有不少于20dB的余量。

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什么是刻帖?

题型:单项选择题

瑞利散射的大小与光波长的()成反比。

A.2次方成正比

B.2次方成反比

C.4次方成正比

D.4次方成反比

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