试题与答案

运输需求的内在实质表现为运输需求的空间效用和运输需求的()。 A.波动性  B.经济

题型:单项选择题

题目:

运输需求的内在实质表现为运输需求的空间效用和运输需求的()。

A.波动性 

B.经济性 

C.派生性 

D.普遍性

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:单项选择题 案例分析题

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自耦变压器降压起动时,起动转矩的表达式为()。

A.kMq

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C.k3Mq

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