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單項選擇題

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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單項選擇題

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

單項選擇題

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

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