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單項(xiàng)選擇題

Lifeboat launching is operated at intervals of （）months.

A.one
B.two
C.three
D.four

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單項(xiàng)選擇題

Fire drill is carried out once a （）.

A.year
B.day
C.week
D.month

單項(xiàng)選擇題

Any emergency pump situated （）machinery space should also be started.

A.outside
B.under
C.beside
D.besides