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问题 选择题

“近朱者赤，近墨者黑。”这句成语比喻接触好人学好人，做好人；接触坏人学坏人，使人变坏。它告诉我们 [ ]

A．交朋友应少而精

B．朋友越多越好

C．交友一定要慎重

D．好人、坏人都得交．

答案

答案：C

判断题

地籍不是静态的，必须经常更新，保持资料的记载和数据统计的连续性，否则难以反映它的现势性。()。
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单项选择题

A transport layer protocol usually has several responsibilties. One is to create a process-to-process communication UDP uses （1）numbers to accomplish this. Another responsibility is to provide control mechanisms at the transport level UDP does this task at a very minimal level. There is no flow control mechanism and there is no （2）for received packet. UDP, however, does provide error control to some extent. If UDP detects 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 send streams of data to the transport layer. It is the responsibility of the transport layer at（4）station to make the connection with the receiver chop the stream into transportable units, number them, and send them one by one. it is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived, check and pass those that are （5） free, and deliver them to the receiving process as a stream.

（3）是（）

A.jobs

B.processes

C.programs

D.users
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