A virtual rise in the center of gravity may be caused by（）.
- Afilling a partially filled tank
- Busing an on board crane to lift a freely swinging heavy object
- Cemptying a partially filled tank
- Dtransferring ballast from the forepeak to the after peak
问题
A virtual rise in the center of gravit
参考解析：
分类：船舶结构基本知识题库
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