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测量1千伏以上和1干伏以下的电气设备绝缘电阻用什么兆欧表？

答案

参考答案：

测量1千伏以上的电气设备绝缘电阻用.2500伏的兆欧表；测量1千伏以下的电气设备绝缘电阻用1000伏或500伏的兆欧表。

单项选择题

You want to use the Web to let Eternal users or your customers look at corporate information. But you want to keep installation at the user end (66) and you don’t want just anyone to get (67) your databases.

That may be where an application server enters the picture. For more user machine independent, these t software packages, typically written in the (68) programming language.

for use on Windows NT-based systems, act as go-betweens linking browser-equipped end users to the databases that (69) the information they need to (70) 。

（67）处填（）。

A．into

B．off

C．onto

D．out
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选择题

萌发的种子，细胞内代谢活动旺盛；干燥的种子，细胞内代谢缓慢，这说明[ ]

A．水是细胞内代谢活动的产物

B．自由水是细胞内代谢活动的必要物质

C．水是细胞内的主要成分

D．以上三项都正确

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