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單項(xiàng)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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單項(xiàng)選擇題

Close the （）.

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

單項(xiàng)選擇題

Which pump is the self-priming pump?（）

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

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