问题 单项选择题

冲击电压试验时,对被试回路进行三个正脉冲,三个负脉冲试验,脉冲间隔时间不小于()。

A、1s

B、2s

C、5s

D、1min

答案

参考答案:C

解析:题目来源:220kV~500kV电力系统故障动态记录装置检测要求
专业类型:继电保护
设备类型:电力系统
难度等级:较难
电压等级:220kV~500kV
知识点:保护原理

改错题
短文改错。
     此题要求改正所给短文中的错误:对标有题号的每一行作出判断;
     如有错误(每行只有-个错误),则按下列情况改正:
     此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线削掉。
     此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
     此行错一个词:在错的词下划一个描线,在该行右边横线上写出改正后的词。
     注意:原行没有错的不要改。
Dear Susan,
I'm very glad to hearing you are coming to visit
me the next Friday. Unfortunately, I won't be able to 
meet you at the airport although I have classes in the
afternoon. You won't find difficult to get to the city
center. The airport bus leaves every 30 minute and
will take you rightly to the Friendship Hotel. My class
will be over by then or I will pick you up there. I will
take you together to a hot-pot restaurant for dinner
and we'll talk with our plan for the weekend over
dinner. Having a pleasant trip and see you Friday. 
                                                            Yours
                                                           Zhang Ming

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