单选题By regulation，cargo tanks must be inert before and during what operation?（）.AStrippingBLoadingCCleaningDCrude oil washing
单选题
By regulation，cargo tanks must be inert before and during what operation?（）.
A
Stripping
B
Loading
C
Cleaning
D
Crude oil washing
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An inert gas system installed on a tanker is designed to ______.A.aid in the stripping and cleaning of cargo tanksB.increase the rate of discharge of cargoC.force toxic and explosive fumes from a cargo tank to vent to the outside atmosphereD.lower the oxygen levels inside cargo tanks，making explosion nearly impossible
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