In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.<br>A:open and individual tank valves open<br>B:open and the individual tank valves closed<br>C:closed and the individual tank valves closed<br>D:closed and the individual tank valves open

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 open

出自：海船船员证

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