题目内容

离心泵启动前泵体内都要首先灌满液体。

A. 正确
B. 错误

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A. Land first sighted when vessel approaching from seaward
B. Land last sighted when vessel leaving from a port
C. in sight of one another when vessel underway
D. in sight of an island during a ship on her voyage

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高等学校体育是我国培养()高级专门人才的需要。

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