单选题For the purpose of training and drills，if reasonable and practicable，rescue boats on an OSV must be launched with their assigned crew（）.Aonce a weekBonce a monthConce a yearDtwice a year
单选题
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
参考解析
解析：
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