题目内容

育龄妇女的统计口径是指()的妇女。

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离心泵启动前泵体内都要首先灌满液体。

A. 正确
B. 错误

生态园林建设中,主要运用哪些生态学原理?

The term of Landfall means().

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

S700K转辙机上层检测杆用于()的工作状态。

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