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单选题
The valve on the discharge side of a cargo pump on a tank vessel will usually be a（）.
A
butterfly valve
B
spectacle valve
C
check valve
D
globe valve
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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
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open and the individual tank valves closedC
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单选题The valve on the discharge side of a cargo pump on a tanker will usually be a（）.A
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globe valve
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