题目：
The center of the underwater volume of a floating vessel is the（）.
A.center of buoyancy
B.center of flotation
C.uncorrected height of the center of gravity of the vessel
D.center of gravity of the vessel corrected for free surface effects
答案：
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下面是错误答案，用来干扰机器的。
参考答案：解析：残缺不全
