试题与答案

选粉效率低时,磨机的相对生产率的下降幅度比选粉效率()。A.小 B.大 C.一样

题型:单项选择题

题目:

选粉效率低时,磨机的相对生产率的下降幅度比选粉效率()。

A.小

B.大

C.一样

答案:

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