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【单选题】
对于Pr数，下列说法哪个是错误的？A.
它是动力粘度与热扩散率的比值
B.
它反映了流体中热量扩散和动量扩散的相对程度
C.
对于层流流动，当Pr=1时，δ=δt
D.
它是研究对流传热最常用的重要准则
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举一反三
【判断题】The family is the most important consumer buying organization in American society.
A.
正确
B.
错误
【单选题】In most markets, consumer surplus
A.
reflects economic well-being.
B.
reflects the total value that buyers place on goods or services.
C.
reflects the benefit to buyers mandated by government.
D.
All of the above are correct.
【简答题】Many manufactured products and most consumer goods in the United States are transported by ______________ 。
【单选题】The park_we had a picnic last week is pretty beautiful.
A.
in where
B.
which
C.
where
D.
that
【单选题】What is the most important consumer buying organization in society?
A.
family
B.
social class
C.
membership group
D.
subculture
E.
reference group
【单选题】The most direct way to market a consumer good is
A.
producer to wholesaler to retailer to consumer.
B.
Producer to retailer to consumer.
C.
Producer to agent/broker to wholesaler to retailer to consumer.
D.
All of the above are equally direct in terms of providing a consumer good to the buyer.
【简答题】R________ (相对地)speaking, most consumer goods in in Wal-Mart are cheaper than those in other supermarkets.
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