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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

A.mooring tension
B.riser tension
C.lifesaving equipment
D.structural strength

單項(xiàng)選擇題

（）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.

A.Free board
B.Stability height
C.Metacentric height
D.Draft

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