单选题When steering by autopilot,how often should the steering be checked?（）A12 times on each watchBWhen time allowsCAt least once a watchDNo checking is necessary
单选题
When steering by autopilot,how often should the steering be checked?（）
A
12 times on each watch
B
When time allows
C
At least once a watch
D
No checking is necessary
参考解析
解析：
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