A.than
B.then
C.when the line pull reaches the breaking strengh of the fall
D.while
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A.center of buoyancy
B.center of floatation
C.center of gravity
D.tipping center
A.water-tight
B.air-tight
C.fire-tight
D.oil-tight
A.moved and fitting again
B.removed and refitted
C.reproduced and put on again
D.return and attached again
A.fire drills
B.washing and cleaning
C.fumigation
D.quarantine
A.the supercargo's
B.the shipper's
C.the shipowner's
D.carrier's
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（）is where the crew eat their meals.
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The company should establish and maintain procedures to control all documents and date which are relevant to（）.
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Which of the following is not an operation mode of AIS?（）
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Fog is likely to occur when there is little difference between the dew point and the（）.