单项选择题
A.the fuel tank fill pipe should be left open to allow vapors to vent from the tank
B.the engine should be started immediately to prevent vapor lock in the fuel line
C.all hatches should be opened and all compartments should be ventilated
D.open the fuel line and drain a small amount of gasoline into the bilge to clear the line of sediment
单项选择题 When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.
单项选择题 What would you consult to determine the number of persons required on duty while loading a cargo of leaded gasoline on your tanker? （）
单项选择题 What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.