单项选择题
Reducing the liquid free surfaces in a vessel reduces the（）.
A.roll period
B.metacentric height
C.waterplane area
D.vessel's draft
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Owing to the big draft，the ship is not permitted to go alongside until the time of（）.
A.ebb tide
B.flood tide
C.spring tide
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单项选择题
On the cargo manifest，the gross weight of a box containing cargo is the weight of the（）.
A.cargo
B.box
C.cargo and box
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单项选择题
On a vessel，multiplying a load’s weight by the distance of the load’s center of gravity above the baseline results in a(n)（）.
A.transverse moment
B.vertical moment
C.righting moment
D.inclining moment
