[单选题]离心泵转速降低时( )。

正确答案 ：D

以上全部

[单选题]在下列何种情况下，可认为火势已被控制住：

正确答案 ：D

以上都对。

[单选题]Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?

正确答案 ：C

Operating the engine while maintaining a high sea water outlet temperature

[单选题]落水者体温下降的速度取决于几个条件：

正确答案 ：B

3个

[单选题]The______Convention is the first to establish basic requirements on training, certification and watch-keeping for seafarers on an international level.

正确答案 ：A

STCW78

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