单项选择题

At an angle of loll，the righting arm (GZ) is（）.

A.maximum
B.negative
C.positive，but reflexive
D.zero

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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

单项选择题

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)（）.

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