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單項選擇題

When fighting a fire in an enclosed space，the hose team should crouch as low as possible to（）.

A.protect themselves from smoke
B.obtain the best available air
C.allow the heat and steam to pass overhead
D.All of the above

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單項選擇題

When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.

A.aimed at the source of the flames
B.fogged above the equipment
C.shot off a flat surface onto the flames
D.used to shield against electrical shock

單項選擇題

When dry chemical extinguishers are used to put out class B fires，there is a danger of reflash because dry chemical（）.

A.is not an effective agent on Class B fires
B.does little or no cooling
C.dissipates quickly
D.is rapidly absorbed by the liquid

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