救生艇下水每隔三个月进行一次。（）<br>A:Lifeboat launching is operated at intervals of three months.<br>B:Lifeboat launching is operated at intervals for three months.<br>C:Fire drill is carried out once a month.<br>D:Don’t operate two or more hatch covers at the same time.

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.

出自：船舶水手证

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