Shipboard Emergency Drills must be carried out at least（）on board cargo ship.<br>A:Once every third year<br>B:Once a month<br>C:Once a year<br>D:Once a week

Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
A:Once every third year
B:Once a month
C:Once a year
D:Once a week

出自：海船船员证

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