单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
Which of the following pumps belongs to centrifugal pump?（）
A.Reciprocating pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump -
单项选择题
The advantage of a centrifugal pump as compared with a reciprocating pump is that （）.
A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true
