单项选择题
When possible，what should be the FIRST step in combating a fire on deck resulting from a cargo overflow or a leaking cargo line?（）
A.Blanket the cargo spill with foam B.Prevent the spread of fire with a foam dam C.Apply CO2 on burning fuel at its source D.Shut off the transfer of cargo
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?（）
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（）.
