單項(xiàng)選擇題

Proper combustion in a boiler would be indicated by （）.

A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame

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單項(xiàng)選擇題

Black smoke coming from a boiler can be caused by （）.

A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio

單項(xiàng)選擇題

Which of the following pumps belongs to centrifugal pump?（）

A.Reciprocating pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump

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