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You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE? （）
A:Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned
B:The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank
C:The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue
D:Steam cleaning and water washing are both capable of generating electrostatic charges within a tank

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出自：海船船员证

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