单项选择题
When possible，what is the FIRST step in fighting an engine fuel-pump fire which results from a broken fuel line?（）
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
单项选择题 When must a dry chemical fire extinguisher be recharged?（）
单项选择题 When loading or discharging dry mud or cement，crew members should use facial respirator masks and（）.
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（）.
