单选题The（） is fitted in pair one is the main valve, the other the auxiliary or standby.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题
The（） is fitted in pair one is the main valve, the other the auxiliary or standby.
A
main stem stop valve
B
auxiliary steam stop valve
C
feed check or control valve
D
blow down valve
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