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问题 单项选择题

产后出血病因中最常见的是（）

A.胎盘嵌顿

B.凝血功能障碍

C.宫颈撕裂

D.产后子宫收缩乏力

E.副胎盘滞留

答案

参考答案：D

解析：ABCDE均为产后出血的原因，其中子宫收缩乏力最常见，占2/3。

单项选择题

The Border Gateway Protocol (BGP) is an interautonomous system. （1）protocol. The primary function of a BGP speaking system is to exchange network（2）information with other BGP system. This network reachability information includes information on the list of Autonomous System (ASs) that teachability information traverses. BGP-4 provides a new set of mechanisms for supporting （3） interdomain routing. These mechanisms include support for advertising an IP （4）and eliminate the concept of network class within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including（5）of AS paths. These changes provide support for the proposed supernettting scheme.

4（）

A.suffix 

B.prefix 

C.reflex 

D.infix
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填空题

要求打开随机文件“C:\Example.txt”文件，文件号为1。实现的语句是______。
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