船舶液压起货机的制动器通常靠()松闸。

【名词&注释】

压缩空气(compressed air)、制动器(brake)

[单选题]船舶液压起货机的制动器通常靠()松闸。

A. 油压力
B. 电磁力
C. 弹簧力
D. 压缩空气

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学习资料：

[单选题]If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.

A. the crankcase explosion
B. lifting of the cylinder safety valve
C. a scavenge fire
D. opening of the manhole

[单选题]The unit of electrical power is the _____.

A. ampere
B. kilovolt
C. watt
D. farad

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