單項選擇題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


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1.單項選擇題A hygrometer is a device used for determining（）.

A.the absolute temperature
B.atmospheric pressure
C.wind velocity
D.relative humidity

2.單項選擇題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

3.單項選擇題A life line must be conncted to the life raft（）.

A.at the bow
B.at the stern
C.in the middle
D.all around

4.單項選擇題A life raft which has inflated bottom-up on the water（）.

A.should be righted by standing on the carbon dioxide cylinder, holding the righting straps, and leaning backwards
B.should be righted by standing on the life line, holding the righting straps, and leaning backwards
C.will right itself when the canopy tubes inflate
D.must be cleared of the buoyant equipment before it will right itself

5.單項選擇題A load line of a ship is assigned by the（）.

A.minerals management service
B.Department of energy
C.corps of engineers
D.a recognized classification socitey approved