单项选择题

Stability is determined principally by the location of the point of application of two forces: the downward-acting gravity force and the（）.

A.upward-acting weight force
B.downward-acting weight force
C.upward-acting buoyant force
D.environmental force

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单项选择题

Stability is determined by the relationship of the center of gravity and the（）.

A.water depth
B.keel
C.center of flotation
D.center of buoyancy

单项选择题

Repair of vital machinery and services on a ship should be accomplished（）.

A.after control of fire，flooding，and structural repairs
B.immediately
C.after control of fire，but before control of flooding
D.after stability is restored