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问题 填空题

根据17×23=391，直接写出下列各题结果．

391÷17=______，17×______=3.91，

39.1÷______=17，______×2.3=0.391．

答案

（1）391÷17=23，（2）17×0.23=3.91；

（3）39.1÷2.3=17，（4）0.17×2.3=0.391；

故答案为：23，0.23，2.3，0.17．

单项选择题

29岁闭经3年，孕激素试验阴性，雌激素试验阳性，垂体兴奋试验，结果LH值比注射LHRH前高4倍，可诊断哪种闭经：

A．子宫性

B．卵巢性

C．垂体性

D．下丘脑性

E．大脑皮层功能失调
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单项选择题

For (21) service，we need a virtual-circuit subnet．Let US see how that works．The idea behind virtual circuits is to avoid having to choose a new (22) for every packet sent．Instead， when a connection is established，a route from the (23) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (24) ．That route is used for all traffic flowing over the connection，exactly the same way that the telephone system works． When the connection is released．the virtual circuit is also tenninated．With connection-oriented service，each packet carries an (25) telling which virtual circuit it belongs to．

A．connectionless

B．connection—oriented

C．datagram

D．telegram
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