单项选择题
A.Secure all engine room doors，hatches，and vents B.Close the fuel line valve C.Check the spread of the fire with foam D.Cast the barge off the wharf
When must a dry chemical fire extinguisher be recharged...
单项选择题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
When loading or discharging dry mud or cement，crew memb...
单项选择题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
When joining the female coupling of the fire hose to th...
单项选择题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
