A.has learnt
B.have learnt
C.learn
D.are learning
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A.closed discharge valve
B.broken pipe line
C.worn shaft
D.both A and B
A.keyway
B.shaft
C.valve
D.casing
A.self priming
B.positive displacement
C.reciprocating
D.impeller
A.turbine
B.screw
C.vane
D.ejector
A.turbine
B.screw
C.vane
D.ejector
最新試題
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
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To proceed to the assistance of a ship in distress is（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
The cetane rating of diesel fuel is an indication of the （）
Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
Flame failure in an automatically fired auxiliary boiler can from a/an （）