单项选择题

At an angle of loll，the capsizing moment is（）.

A.maximum
B.negative
C.positive
D.zero

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At all angles of inclination，the metacenter is（）.

A.vertically above the center of buoyancy
B.vertically above the center of gravity
C.at the intersection of the upright vertical centerline and the line of action of the buoyant force
D.at the geometric center of the underwater volume

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As a ship moves through the water，it causes a wake，which is also moving forward relative to the sea. In addition to a fore and aft motion，this wake also has a(n)（）.

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B.downward and outward flow
C.upward and inward flow
D.upward and outward flow

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Angular motion about the vertical axis of a vessel is called（）.

A.yaw
B.surge
C.sway
D.roll