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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相关考题
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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 -
单项选择题
The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.
A.fuel valves of main engine
B.injector pump of main engine
C.safety valves of marine boiler
D.safety valves of a reciprocating pump
