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
单项选择题 Stability is determined by the relationship of the center of gravity and the（）.
单项选择题 Repair of vital machinery and services on a ship should be accomplished（）.
单项选择题 Initial stability refers to stability（）.
