When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery,the atmosphere must be sampled().

A . one meter from the tank bottom and one meter below the tank top B . one half the ullage of the tank and one meter below the tank top C . one half the ullage of the tank and one meter above the tank bottom D . at three meter intervals from the tank to

时间:2022-11-08 06:18:55 所属题库:货物装卸货作业题库

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