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单选题
In order to determine the trimming arm for your vessel at any particular draft, which of the following would you compare?（）.
A
Longitudinal center of buoyancy and longitudinal center of gravity
B
Longitudinal center of floatation and longitudinal center of gravity
C
Longitudinal center of floatation and longitudinal center of buoyancy
D
Longitudinal tipping center and longitudinal center of gravity
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