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单选题
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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单选题A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）A
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furnace to be re-purgedB
electric charge to buildup in the igniterC
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create turbulence in the combustion chamberB
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yellowish flameB
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injection pressureB
shape of combustion spaceC
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