A moment is obtained by multiplying a force by its（）.

A.couple
B.lever arm
C.moment of inertia
D.point of application

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A load line is assigned to a ship to insure adequate stability and（）.

A.mooring tension
B.riser tension
C.lifesaving equipment
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（）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.

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Your vessel was damaged and initially assumed a significant list and trim; however，further increase has been slow. Based on this data，what should you expect?（）

A.The slowing is only temporary and the vessel will probably suddenly capsize or plunge from loss of stability due to change in the waterplane area
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D.The vessel will suddenly flop to the same or greater angle of list on the other side and may capsize

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