题目内容

multiple effect evaporation

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WK-10A型电铲的拉门机构和WK-4型电铲的拉门机构相同。()

Which of the following contains a derivational morpheme?

A. walking
B. imagination
C. apple
D. passed

直流电机的选择主要根据生产机械性能要求来进行的。()

water extraction and alcohol precipitation

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