单项选择题
A.main stem stop valve B.auxiliary steam stop valve C.feed check or control valve D.blow down valve
The（） is fitted in pair one is the main valve, the othe...
单项选择题The（） is fitted in pair one is the main valve, the other the auxiliary or standby.
The（） is a smaller valve fitted in the auxiliary steam ...
单项选择题The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.
The（）is fitted in the main steam supply line and is usu...
单项选择题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
