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问题 选择题

废电池造成污染的问题日益受到关注．集中处理废电池的首要目的是（　　）

A．回收石墨电极

B．利用电池外壳的金属材料

C．防止电池中渗泄的电解液腐蚀其他物品

D．防止电池中汞、镉和铅等重金属离子对土壤和水源的污染

答案

答案：D

单项选择题

Routing protocols use different techniques for assigning(71)to individual networks. Further, each routing protocol forms a-metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal(72).Some routing protocols can even use multiple paths when paths have an unequal cost. In either case,load (73)can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination lad balancing. Per-packet load balancing distributes the(74)across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on(75).

74（）

A．destinations

B．resources

C．packets

D．sources
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单项选择题

当液耦油温升高接近（）时，易融塞中的低熔点合金就会融化喷油。

A、100℃；

B、90℃；

C、134℃；

D、135℃。
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