
【名词&注释】
轴功率(shaft power)、救生艇(boat)、救生筏(life raft)
[单选题]泵的总效率是指( )。
A. 实际流量与理论流量之比
B. 实际扬程与理论扬程之比
C. 有效功率与轴功率之比
D. 传给液体的功率与输入功率之比
查看答案&解析
举一反三:
[单选题]救生艇上应以经久的明显字迹标明()
A. 建造材料
B. 乘员定额
C. 机器型号
[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()
A. 在水中能够漂浮、时间不少于30min
B. 在水中能够漂浮、时间不少于40min
C. 在水中能够漂浮、时间不少于20min
[单选题]重力式降放救生艇的吊钩脱开装置应该()
A. 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
B. 发出警示后,在无负荷情况下应该能够脱开吊艇钧
C. 有负载时,应该能够同时脱开所有的吊艇钧
[单选题]A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with .
A. a high viscosity index
B. a low viscosity index
C. neutralize acids
D. resist oxidation at high temperatures
[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.
A. available minimum requirements
B. available maximum requirements
C. mandatory minimum requirements
D. mandatory maximum requirements
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