单项选择题

A.aid in the stripping and cleaning of cargo tanksB.inc……

An inert gas system installed on a tanker is designed to（）.

A.aid in the stripping and cleaning of cargo tanks
B.increase the rate of discharge of cargo
C.force toxic and explosive fumes from a cargo tank to vent to the outside atmosphere
D.lower the oxygen levels inside cargo tanks，making explosion nearly impossible

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