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问题 单项选择题

以下哪一项不属于风险沟通的作用？（）

A.履行法律赋予公众的知情权

B.提醒公众在重大灾害事件降临前夕，做好各项应急准备工作

C.改变公众对风险的态度和行为

D.利用公众恐惧心理减轻政府承受的压力

答案

参考答案：D

单项选择题

苯是（）的液体。

A．无色无味

B．有色无味

C．无色有芳香气味

D．有色有芳香气味
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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．

68（）

A．sending

B．receiving

C．switching

D．routing
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