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單項(xiàng)選擇題

The preferred type of pollution control for oil spills on the water is(are) （）.

A.straw
B.booms
C.skimmers
D.chemical dispersants

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單項(xiàng)選擇題

The preferred agent used in fighting a helicopter crash fire is（）.

A.CO₂
B.dry chemical
C.water
D.foam

單項(xiàng)選擇題

The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing（）.

A.45°upward
B.vertically upward
C.vertically downward
D.all of the above

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