For the purpose of training and drills，if reasonable and practicable，rescue boats on an OSV must be launched with their assigned crew（）.<br>A:once a week<br>B:once a month<br>C:once a year<br>D:twice a year

For the purpose of training and drills，if reasonable and practicable，rescue boats on an OSV must be launched with their assigned crew（）.
A:once a week
B:once a month
C:once a year
D:twice a year

出自：海船船员证

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