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问题 选择题

图中商品甲、乙是两种互不关联的普通商品当两商品的价格P均从P1同幅下降到P2时，对于需求量Q的变化，若有如下判 断：①两商品的需求量与价格同向变动   ②两商品的需求量与价格反向变动   ③两商品相比，商品甲是高档耐用品   ④两商品相比，商品甲是生活必需品 

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A．①③    

B．①④   

C．②③    

D．②④

答案

答案：D

判断题

式NU=0.023RenPr(1/3)φ是换热器的通用膜传热系数表达式。
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单项选择题

Routing protocols use different techniques for assigning (81) 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 (82) . Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load (83) 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 load balancing. Per-packet load balancing distributes the (84) across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on (85) .

（82）是（）

A.user

B.distance

C.entity

D.cost
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