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

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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