正确答案: C

有效功率与轴功率之比

题目：泵的总效率是指( )。

解析：C

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举一反三的答案和解析：

[单选题]救生艇上应以经久的明显字迹标明（）

乘员定额

[单选题]满载救生筏体和属具备品的容器在落入水中后要求（）

在水中能够漂浮、时间不少于30min

[单选题]重力式降放救生艇的吊钩脱开装置应该（）

在无负荷和有负载情况下，应该都能够同时脱开所有的吊艇钩

[单选题]A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with .

a high viscosity index

[单选题]STCW78/95 Convention describes that _____ are laid down for the certification of engineer officers in charge of a watch in a traditionally manned engine room, or the designated engineer in a periodically unmanned engine room.

mandatory minimum requirements