单项选择题

Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）

A.Water stream
B.Water fog or apray
C.Steam
D.Dry chemical

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单项选择题

When loading or discharging dry mud or cement，crew members should use goggles and（）.

A.facial respirator mask
B.ear plugs
C.rubberized boots
D.fireman's outfit

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When collecting condensation for drinking water，（）.

A.a sponge used to mop up and store condensation must be kept salt free
B.only condensation on the bottom of the canopy should be collected
C.it should be strained through a finely woven cloth
D.chlorine tablets should be used to make it drinkable

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When choosing extinguishers to fight a Class “B” fire do NOT use（）.

A.carbon dioxide
B.dry chemical
C.foam (stored-pressure type)
D.water (cartridge-operated)