單項選擇題When an auxiliary boiler is panting and emitting black smoke, you should ().

A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply


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1.單項選擇題Close the ().

A.keyway
B.shaft
C.packing
D.valve

2.單項選擇題Which pump is the self-priming pump?()

A.turbine
B.centrifugal
C.ejector
D.mixed flow

3.單項選擇題The younger motorman as well as the others () to operate the oil separator.

A.has learnt
B.have learnt
C.learn
D.are learning

4.單項選擇題A water pump can not supply water after startingIt may be caused by ().

A.closed discharge valve
B.broken pipe line
C.worn shaft
D.both A and B

5.單項選擇題Dress up the ().

A.keyway
B.shaft
C.valve
D.casing