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问题 单项选择题

进行油浸式站用变出厂验收的压力释放装置试验，报警回路应经受50Hz，2000V，1min的绝缘试验，绝缘电阻不小于（）MΩ。

A.1

B.2

C.3

D.4

答案

参考答案：A

单项选择题

所谓层内矛盾是指在一个油层的内部，上下部位有差异，渗透率大小不均匀，高渗透层中有低渗透带，低渗透层中有高渗透带，注入水沿阻力小的（）渗透带突进。

A、高

B、中

C、低

D、特低
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单项选择题

An internet is a combination of networks connected by （1）. When a datagram goes from a source to a （2）, it will probably pass many （3） until it reaches the routerattached to the destination network. A router receives a （4）from a network and passes it toanother network. A router is usually attached to several networks. When it receives a packet, towhich network should it pass the packet The decision is based on optimization: Which of theavailable（5） is the optimum pathway

（4）是（）

A.destination

B.resource

C.packet

D.source
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