一般隔离开关没有灭弧装置,不允许它()分、合闸操作。A、空载时进行 B、母线切换 C

题型:单项选择题

问题:

一般隔离开关没有灭弧装置,不允许它()分、合闸操作。

A、空载时进行

B、母线切换

C、带负荷进行

D、带电压时进行

考点:电工进网证考试电工进网证(高压类)电工进网证(高压类)题库
题型:单项选择题

下列加点字的读音有误的一项是( )

A 弑君(shì)    社稷 (jì)     讷于言 (nè)

B 探囊 (náng)  罔罟 (gǔ)     观其徼(jiào)

C 厚敛 (liǎn)  三爵 (jué)    衮职(gǔn)

D 藏獒(áo)     稽首(jǐ)    翳桑(yī) 

题型:单项选择题

阅读理解。

       George worked in London; He was still a single (单身的) . He usually had his lunch,and sometimes

  his dinner, in a small restaurant.

       One evening he decided to go to an expensive restaurant. When he got in, he suddenly saw Tom, a

  friend of his. They hadn't seen each other since they left school. George went up to Tom and said politely

  to him, "Hello, Tom. Nice to see you here. How's your business?"

       "Oh, George,"  answered  Tom, " It's  not  good at all. "

       George looked in surprise at the expensive food and drinks on Tom's table and said, "It certainly

  doesn't look like what you said. "

       "Well," Tom answered sadly, "I'm afraid you're wrong. A few years ago, I was doing well, and I often

  brought my wife to this place for dinner. But now I can come only by myself."

根据短文内容填词,每空一词。

       George worked in London and was not   1  . He usually went to a small restaurant to have his lunch,

  and sometimes his dinner. But one evening he went into an expensive restaurant. He was   2   to meet his

  friend, Tom. He hadn't seen him since they left school. George said   3   to him and asked about his

  business. Tom said that it didn't go on _4  . George looked at the food and drinks on Tom's table and

  thought Tom   5   to him. Tom then told George that he did better in the past.

1. _____ 2. _____ 3. _____ 4. _____ 5. _____

题型:单项选择题

在“探究小车速度随时间变化的关系”实验中,所用交流电的频率为50Hz.某次实验中得到的一条纸带如图所示,从比较清晰的点起,每五个打印点取一个点作为计数点,分别标明0,1,2,3,4.量得x1=30.0mm,x2=36.0mm,x3=42.0mm,x4=48.0mm,则小车通过点2时的速度为______m/s,小车的加速度为______m/s2(结果取两位有效数字)

题型:单项选择题

下列哪一种因素可造成铸件浇铸不全()。

A.铸型焙烧时间过长

B.安插的铸道粗了

C.支架的蜡型过厚

D.铸造机离心力不足

E.铸造时间过长

题型:单项选择题

当抹灰厚度不变,只换算配合比时应调整()

A.人工费

B.材料费

C.机械费

D.措施费

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