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单选题
The disinfection of various compartment in a vesel by filling them with a gaseous agents to destroy rats ect.means（）.
A
fire drills
B
washing and cleaning
C
fumigation
D
quarantine
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单选题The disinfection of various compartments in a vessel by filling with a gaseous agent to destroy rats and all insects pests which act as germ carriers means（）.A
displacementB
fumigationC
dischargingD
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fire drillsB
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