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单选题
In setting the valves on a steam-smothering system on a tank vessel，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
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单选题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 openB
open and the individual tank valves closedC
closed and the individual tank valves closedD
closed and the individual tank valves open
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