判断题

在一般情况下,压力对粘度的影响比较大,而温度对粘度的影响比较小。

A.正确
B.错误


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单项选择题

Which of the following is not a characteristic of a perfect competitive market?

A.Price, cost, and quality information are equally distributed
B.A nearly infinite set of suppliers compete against one another
C.Customers have access to all relevant information worldwide
D.It is highly regulated