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问题 单项选择题

女，32岁，排便时或久蹲后，肛缘皮下有柔软青紫色团块隆起，可伴有坠胀感，团块物按压后可消失。应诊断为（）

A.结缔组织性外痔

B.静脉曲张性外痔

C.炎性外痔

D.血栓外痔

E.混合痔

答案

参考答案：B

单项选择题

下列支票要素中，可以更改的是（）。

A、用途

B、金额

C、日期

D、收款人名称
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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．source

B．route

C．destination

D．host
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