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單項(xiàng)選擇題

Portable foam type fire extinguishers are most effective on（）.

A.mattress fires
B.oil fires
C.wood fires
D.All of the above

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單項(xiàng)選擇題

Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.

A.only when fully loaded
B.if one or more tanks are full
C.when transferring cargo
D.only when the barge is being towed

單項(xiàng)選擇題

Portable CO₂ fire extinguishers should NOT be used to inert a space containing flammable liquids due to the danger of（）.

A.the CO₂ being inhaled by personnel
B.reflash of burning liquids
C.vapor condensation on the extinguisher
D.the discharge causing a static spark

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