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问题 多项选择题

在高土壤电阻率地区，接地电阻值很难达到要求时，可采用（）措施降低接地电阻。

A、采用多层接地措施

B、在变电站附近有较低电阻率的土壤时，可敷设引外接地网或向外延伸接地体

C、当地下较深处的土壤电阻率较低时，可采用井式或深钻式深埋接地极

D、加密接地体

答案

参考答案：A, B, C

解答题

1吨的铁板比1千克的棉花重．…______．（判断对错）
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填空题
从方框中选择正确选项完成对话，其中有两项是多余的。
A.What about you?    
B.Would you like blacd tea?
C.Do you have any eggs ,madam?
D.Would you like something to eat?
E.Black tea or iced (有冰的）tea?
F.Can I help you?
G.Thank you very much.
Woman:小题1:
Ben: Yes, madam. What would you like to drink, Tony?
Tony: I’d like some tea.
Ben:小题2:
Tony:Iced tea ,please,小题3:
Ben: I’d like some lemonade(柠檬).小题4:
Tony:Yes, I’d like a pizza, please.
Woman: What would you like on it ,sir?
Tony: Mushrooms(蘑菇） ,green peppers（青椒） and onions,please.
Ben:All right.小题5:
Woman: Yes.
Ben: We want a cup of iced tea, a glass of milk, a glass of lemonade ,a pizza and two eggs, please.
Woman: OK.
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