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问题 不定项选择题

室温下，把MgCl2的饱和溶液和蒸馏水区别开来，下列方法中不可行的是[ ]

A．加肥皂水

B．降温至0℃看是否凝固

C．测导电性

D．分别通二氧化碳看是否有沉淀

答案

答案：D

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.

5（）

A.reservation 

B.utilization 

C.aggregation 

D.connection
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单项选择题

慢性毒作用带是指（）

A.半数致死剂量与急性阈剂量的比值

B.急性阈剂量与慢性阈剂量的比值

C.半数致死量与慢性阈剂量的比值

D.急性致死量与半数致死量的比值

E.急性阈剂量与绝对致死量的比值
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