Frapping lines are fitted to lifeboat davits to（）.

单项选择题If you hear more than six short blasts and one long blast of the whistle supplemented by the same signal on the general alarm，you should（）.

A.start the fire pump
B.go to your man overboard station
C.go to your lifeboat station
D.stand by for collision

单项选择题Line throwing equipment should not be operated（）.

A.during a rain storm
B.in an explosive atmosphere
C.near a lifeboat station
D.by other than licensed officers

单项选择题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

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