單項(xiàng)選擇題

A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from（）.

A.filling completely
B.developing free surface
C.developing free surface moment
D.collapsing

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A virtual rise in the center of gravity of a ship may be caused by（）.

A.filling a partially filled tank
B.using fuel from a pressed fuel tank
C.emptying a partially filled tank
D.transferring pipe from the setback area to the pipe rack

單項(xiàng)選擇題

A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed?（）.

A.The tanks lie above the waterline and are filled
B.The tanks are partially filled with dry cargo
C.The tanks are partially filled with liquid cargo
D.The tanks are filled and lie below the waterline