单项选择题
A.De-energizes the "charged mist" effect
B.Maintains a positive pressure on the vent header to cool the flammable vapors
C.Inert gas filters out the flammable vapors from the cargo tank spaces
D.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
单项选择题 How about deducting 10 bundles，（）is to say 50 bundles partly rusty?
单项选择题 Fearing damage from either or both of the above incidents，the Master now（）me this note of protest，reserving to himself the right to extend same at time and place convenient．
单项选择题 According to the regulations，what type of gauging is required for a cargo of butadiene? （）