单选题In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.Aopen and individual tank valves openBopen and the individual tank valves closedCclosed and the individual tank valves closedDclosed and the individual tank valves open
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 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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