单项选择题

A.before the boat is lowered from the stowed positionB.……

When launching a lifeboat in the rough sea，the davit gears should be released（）.

A.before the boat is lowered from the stowed position
B.as the boat fall blocks break clear of the davit head
C.before the boat is lowered from the embarkation level
D.after the boat is released into the water

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单项选择题Your vessel has lifeboats on both sides. Lifeboat No. 2 is located（）.

A.forward of lifeboat No. 4 on the starboard side
B.forward of lifeboat No. 4 on the port side
C.aft of lifeboat No. 1 on the starboard side
D.All of the above

单项选择题Your vessel is equipped with totally enclosed lifeboats. Which statement is TRUE when the boat is enveloped in flames?（）.

A.The ventilators will automatically close by the action of fusible links
B.The motor takes its air supply from outside the lifeboat to prevent asphyxiation of the crew
C.A water spray system to cool the outside of the boat is operated by a high-volume manual pump
D.An air tank will provide about ten minutes of air for the survivors and the engine

单项选择题Never（）the lifeboat or lifecraft disengaging locks or hydrostatic release gears because it can cause them to fail to function.

A.oil
B.rig
C.release
D.paint