單項(xiàng)選擇題

CO₂ and Halon extinguishers are used for electrical fire, as well as （）fire.

A.common
B.oil
C.electrical
D.chemical

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Lifeboat launching is operated at intervals of （）months.

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

單項(xiàng)選擇題

Fire drill is carried out once a （）.

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

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