单项选择题

The cargo is now and（）found short during discharging at your port.

A.than
B.then
C.when the line pull reaches the breaking strengh of the fall
D.while

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单项选择题

A.center of buoyancy
B.center of floatation
C.center of gravity
D.tipping center

单项选择题

A.water-tight
B.air-tight
C.fire-tight
D.oil-tight

单项选择题

A.moved and fitting again
B.removed and refitted
C.reproduced and put on again
D.return and attached again