问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C