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單項(xiàng)選擇題

When must a dry chemical fire extinguisher be recharged?（）

A.After each use
B.When the air temperature exceeds 90°F
C.Every 6 months
D.Every 12 months

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單項(xiàng)選擇題

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

A.goggles
B.ear plugs
C.soft-soled boots
D.fireman's outfit

單項(xiàng)選擇題

When joining the female coupling of the fire hose to the male outlet of the hydrant，you should make sure that the（）.

A.threads are lubricated
B.nozzle is attached to the hose
C.female coupling has a gasket
D.hose is led out

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