单选题A ship is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is（）.ApositiveBnegativeCzeroDvertical
单选题
A ship is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is（）.
A
positive
B
negative
C
zero
D
vertical
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