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问题 单项选择题

吊线的原始垂度，在20℃以下时允许偏差应大于标准垂度的（）％；在20℃以上时，应不大于标准垂度的（）％。

A.5、10

B.10、15

C.10、5

D.15、10

答案

参考答案：C

单项选择题

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

A router receives a （） from a network and passes it to another network.

A．destination

B．resource

C．packet

D．source
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单项选择题

个人信息源又称为（）

A、文献信息源

B、口头信息源

C、生物信息源

D、实物信息源
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