搜题请搜索小程序“爱下问搜题”
问题 单项选择题

接地电阻的数值等于（）。

A.接触电位差与接地故障电流的比值

B.系统相线对地标称电压与接地故障电流的比值

C.接地装置对地电位与通过接地极流入地中电流的比值

D.接地装置对地电位与接地故障电流的比值

答案

参考答案：C

听力题

动词填空  用括号内所给动词的适当形式填空，并将答案写在答卷标有题号的横线上。（本大题共8小题，每小题1分，共8分）

小题1:Amy with her classmates ___________ (mop) the floor at this time yesterday.

小题2:What did you say ___________ (change) his mind just now?

小题3:Ang Lee ___________ (honour) with the Oscar Award for Best Director for his Life of Pi at the 85th Academy Awards Ceremony on February 24th, 2013.

小题4:The problem the leaders paid attention to ___________ (solve) next week.

小题5:— Did you see Tom at the party?

—No, Mary told me that he ___________ (leave) by the time I got there.

小题6:It was said Sam ___________ (get) better marks in the coming exams because he worked harder than before.

小题7:I ___________ (check) my e-mails. There’s nothing new.

小题8:The actor looks happy because the audience ___________ (clap) their hands warmly.
查看答案
单项选择题

水位平衡容器前一次门横装，是为避免阀门（）。

A．积聚空气泡；

B．产生液位差；

C．节流作用。
查看答案