A vessel is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is（）.<br>A:positive<br>B:negative<br>C:zero<br>D:vertical

A vessel 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

出自：海船船员证

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