In setting the valves on a steam-smothering system on a tanker,the master control valve to cargo tanks should be().

A . open and individual tank valves open B . open and the individual tank valves closed C . closed and the individual tank valves closed D . closed and the individual tank valves ope

时间:2022-09-10 03:54:07 所属题库:液体散货运及有关规则题库

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