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 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
The lifting pressure of （） is set in the presence of a ...
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
The propeller is pushed on to the tubeshaft taper and m...
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
