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单项选择题

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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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.

A.main stem stop valve
B.auxiliary steam stop valve
C.feed check or control valve
D.blow down valve
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
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