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问题 改错题

下列词语有四个错别字找出来并改正。

心旷神怡　兴哀荣辱　趾高气扬　花团锦簇　间而言之　小心翼翼

窥谷忘反　风格细拟　如释重负　一筹莫展　彬彬有礼　钟铭鼎食

________　________　________　________

答案

哀—衰　间—简　拟—腻　铭—鸣

单项选择题

The network layer provides services to the transport layer．It can be based on either (67) ．In both cases，its main job is (68) packets from the source to the destination．

In network layer，subnets can easily become congested，increasing the delay and (69) for packets．Network designers attempt to avoid congestion by proper design．Techniques include (70) policy,caching，flow control，and more．

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service．The methods that can be used for this include buffering at the client，trafficshaping，resource (71) ，and admission contr01．Approaches that have been designed forgood quality of service include integrated services(including RSVP)，differentiated services，andMPLS．

71（）

A．distribution

B．reservation

C．scheme

D．guarantee
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单项选择题

基站天馈系统不包括（）

A.馈线

B.天线

C.塔放

D.干放
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