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问题 选择题

2012年2月29日，国务院发布新修订的《环境空气质量标准》。新标准中增加了细颗粒物      监测指标。

A．PM1.5

B．PM2.5

C．PM3.5

D．PM4.5

答案

答案：B

本题为时政题，需掌握本年度有关时政。

选择题

海峡两岸的中华儿女，我们共同努力奋斗，最终实现我们共同的目标[ ]

A．实施“一国两制”

B．建立“中华经济共同体”

C．找到一条海峡两岸人民都接受的统一道路

D．完成祖国统一大业，实现中 * * 的伟大复兴
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单项选择题

BGP is an inter-autonomous system routing protocol; it is designed to be used between multiple autonomous ___40___. BGP assumes that routing within an autonomous system is done by an intra-autonomous system routing protocol. BGP does not make any assumptions about intra-autonomous system ___41___ protocols employed by the various autonomous systems. Specifically, BGP does not require all autonomous systems to run the same intra-autonomous system routing protocol.

BGP is a real inter-autonomous system routing protocol. It imposes no constraints on the underlying Internet topology. The information exchanged via BGP is sufficient to construct a graph of autonomous systems connectivity from which routing loops may be pruned and some routing. ___42___ decisions at the autonomous system level may be enforced.

The key feature of the protocol is the notion of Path Attributes. This feature provides BGP with flexibility and expandability. Path ___43___ are partitioned into well-known and optional. The provision for optional attributes allows experimentation that may involve a group of BGP ___44___without affecting the rest of the Internet. New optional attributes can be added to the protocol in much the same fashion as new options are added to the Telnet protocol, for instance.

44（）

A.routers 

B.states 

C.meters 

D.costs
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