单项选择题

A. Lifeboat launching is operated at intervals of three……

救生艇下水每隔三个月进行一次。（）

A. Lifeboat launching is operated at intervals of three months.
B. Lifeboat launching is operated at intervals for three months.
C. Fire drill is carried out once a month.
D. Don’t operate two or more hatch covers at the same time.

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