单项选择题
A cargo tank that is initially gas freed，can be inerted by introducing inert gas by a process known as（）.
A.dilution
B.displacement
C.precipitation
D.Either A or B
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A.a cargo that will be damaged if it gets wet
B.bulk liquids
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单项选择题
A “dangerous cargo manifest” is needed for you to carry a combustible cargo. You should obtain the shipping papers to make this “manifest” from the（）.
A.manufacturer
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