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问题 填空题

绝缘工具的检查性试验条件是：将绝缘工具分成若干段进行工频耐压试验，每（）耐压（），时间为（），以无击穿、闪络及过热为合格。（要求写出单位）

答案

参考答案：300mm；75kV；1分钟

问答题 简答题

货物的堆码距离要求是什么？
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单项选择题

A transport layer protocol usually has several responsibilities. One is to create a process-to-processcommunication UDP uses（1）numbers to accomplish this. Another responsibility is to provide controlmechanisms at the transport level, UDP does this task at a very minimal level. There is no flow control mechanismand there is no（2）for received packet. UDP, however, does provide error control to some extent. If UDPdetects an error in the received packet, it will silently drop it.

The transport layer also provides a connection mechanism for the processes. The （3）must be able to sendstreams of data to the transport layer. It is the responsibility of the transport layer at （4） station to make theconnection with the receiver chop the stream into transportable units, number them, and send them one by one. Itis the responsibility of the transport layer at the receiving end to wait until all the different units belonging to thesame process have arrived, check and pass those that are （5）free, and deliver them to the receiving process asa stream.

（4）是（）

A.sending

B.routing

C.switching

D.receiving
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