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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相关考题
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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 -
单项选择题
For a propeller direct driven by the engine,（）.
A.the thrust pads are while metal faced on both sides
B.the thrust pads are while metal faced only on the forward side
C.the thrust pads are while metal faced only on the after side
D.intermediate shaft usually supported by a plummer block
