单选题The（）is fitted in the main steam supply line and is usually of the non-return type.Amain steam stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
单选题
The（）is fitted in the main steam supply line and is usually of the non-return type.
A
main steam stop valve
B
auxiliary steam stop valve
C
feed check or control valve
D
blow down valve
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