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问题 单项选择题

2003年南美洲某国家的季度GDP及其构成增速表 单位：%

该国进出口额差距最大的是：（）

A．第一季度

B．第二季度

C．第三季度

D．第四季度

答案

参考答案：A

问答题

在图中画出平面镜前物体AB在平面镜中的像．
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单项选择题

The Border Gateway Protocol (BGP) is an interautonomous system. ___49___ protocol. The primary function of a BGP speaking system is to exchange network ___50___ 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 ___51___ interdomain routing. These mechanisms include support for advertising an IP ___52___ and eliminate the concept of network class within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including ___53___ of AS paths. These changes provide support for the proposed supernettting scheme.

51（）

A. confirmless

B. connectionless

C. answerless

D. classless
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