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问题 解答题

一个等腰三角形的一个底角的度数是顶角的2倍，它的一个底角多少度？

答案

设顶角为x度，则底角为2x度，

x+2x+2x=180，

5x÷5=180÷5，

x=36，

2x=72．

答：它的一个底角72度．

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．jobs

B．processes

C．programs

D．users
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单项选择题 A1型题

干姜人参半夏丸中含有（）

A.生姜汁

B.生姜

C.吴茱萸

D.白蜜
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