正确答案: B

克服船体阻力消耗

题目：船舶有效功率是指船舶航行时（）的功率。

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学习资料的答案和解析：

[单选题]动力系统是为（）服务的管路系统.

A+B

[单选题]单轴系具有直接传动、结构简单可靠、（）和（）的特点。

D．传动准确/便于操纵

[单选题]An overspeed safety device is usually fitted to a generator engine for （） in the event of overspeed.

cutting power off the engine

[单选题]If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.

abnormally high feed water temperature