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
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相关考题
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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 -
单项选择题
The propeller is pushed on to the tubeshaft taper and made tight by（）
A.a mechanical seal
B.keyway and key
C.a nut
D.shrinkage
