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问题 单项选择题

水池的满水试验向池内注水，宜分为（）次。

A.2

B.3

C.4

答案

参考答案：B

问答题 简答题

液压系统进入空气会产生什么现象？
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单项选择题

The CPU does not have to look (66) all of RAM to find the spot it needs. But RAM only (67) the data temporarily. As soon as you switch the computer (68) , all that information disappears from the RAM. When you switch the computer on again, the RAM is (69) , and ready (70) a new program and new data.

（68）处填（）。

A．off

B．on

C．up

D．down
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