接地系统的检查中，断开盘内接线，用接地仪测量一下保护接地系统_爱下问搜题

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问题单项选择题

接地系统的检查中，断开盘内接线，用接地仪测量一下保护接地系统的接地电阻值，应≤（）。

A、2欧姆

B、4欧姆

C、6欧姆

D、8欧姆

答案

参考答案：B

补全对话，情景问答

从B栏中选出与A栏各句相匹配的最佳答语。

                       A 　　
( ) 1. What time is it now? 　　
( ) 2. How did you get to school? 　　
(    ) 3. Would you like some apples? 　　
( ) 4. Where are you sending the letter? 　　
( ) 5. May I take your picture, Jenny? 　　
( ) 6. Can you answer the question? 　　
(    ) 7. What is he doing now? 　　
( ) 8. How many books can you see on the desk? 　　
(    ) 9. How far is it from Shanghai to Beijing? 　　
( ) 10. Was she at home last week?

　 B 　　
A. Yes, you may. 　　
B. It's ten o'clock. 　　
C. No, thanks. 　　
D. By bus. 　　
E. To China. 　　
F. No, I can't. 　　
G. Yes, she was. 　　
H. Only one. 　　
I. It's about two thousand kilometers. 　　
J. He is reading.

问答题简答题

钢丝绳报废标准有哪些？