真空断路器真空的作用是（）。A、绝缘B、灭弧C、降低压力D、绝缘_爱下问搜题

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问题单项选择题

真空断路器真空的作用是（）。

A、绝缘

B、灭弧

C、降低压力

D、绝缘和灭弧

答案

参考答案：D

填空题

Questions 21-28

Complete the table below.
Write NO MORE THAN THREE WORDS for each answer.\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n

PLACE	FUNCTION
(21)	Supply library information; Apply for library card


(22)	Supply computers to search information of books


Leisure Bar	Supply (23)
(24)	Dictionaries; Course books; Literature materials


(25)	Important books
Periodical Room	Current issues; Newspapers; Magazines; (26)


(27)	Photocopier and printer
Conference Room	Work table and (28)

问答题简答题

井下主要水泵房工作水泵排水能力有什么要求？