单选题A virtual rise in the center of gravity may be caused by（）.Afilling a partially filled tankBusing an on board crane to lift a freely swinging heavy objectCemptying a partially filled tankDtransferring ballast from the forepeak to the after peak
单选题
A virtual rise in the center of gravity may be caused by（）.
A
filling a partially filled tank
B
using an on board crane to lift a freely swinging heavy object
C
emptying a partially filled tank
D
transferring ballast from the forepeak to the after peak
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