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问题 问答题 简答题

以100FB-37为例说明其含义？

答案

参考答案：

100——表示泵进水口直径为100mm；

F——表示耐腐蚀泵；

B——表示耐腐蚀泵过流部分的零件材质为1Cr18Ni8Ti；

37——表示泵的扬程为37m。

单项选择题

A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (71) numbers to accomplish this．Another responsibility is to providecontrol mechanisms at the transport level．UDP does this task at a very minimal level．There is no flowcontrol mechanism and there is no (72) for received packet．UDP, however,does provide errorcontrol 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 (73) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74) station to make the connection with the receiver,chop the stream into transportable units，numberthem，and send them one by one．It is the responsibility of the transport layer at the receiving end to waituntil all the different units belonging to the same process have arrived，check and pass those that are (75) flee，and deliver them to the receiving process as a stream．

A．sending

B．routing

C．switching

D．receiving
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单项选择题

在教学工作的基本程序中，( )是上好课的重要保证。

A．备课

B．上课

C．课外作业和课外辅导

D．学业成绩的考核与评定
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