题目内容

园林给水水源可分为()和()。

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The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can immediately be placed in the () of operation when notified that the ship is in congested waters.

A. manual mode
B. automatic mode
C. remote mode
D. follow-up mode

二次回路工作电压不超过220V。

A. 正确
B. 错误

结晶器的振动频率是指结晶器在每小时的振动次数。

A. 正确
B. 错误

铁口浅时,退炮前必须具备出铁条件。

A. 正确
B. 错误

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