单项选择题
A gypsy or gypsyhead is a（）.
A.punt used for painting over the side
B.small, reciprocating steam engine
C.spool-shaped drum fitted on a winch
D.swinging derrick
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相关考题
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单项选择题
A hydrostatic release mechanism for a liferaft（）.
A.must be wet before it will release
B.should be kept in a watertight except in an emergency
C.will inflate the raft in its cradle if operaterd manually
D.must be submerged to a certain depth to release automatically -
单项选择题
A hygrometer is a device used for determining（）.
A.the absolute temperature
B.atmospheric pressure
C.wind velocity
D.relative humidity -
单项选择题
A large oil fire on the deck of a ship can be fought most effectively with（）.
A.dry chemical
B.foam
C.high-velocity fog
D.water
