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单选题
The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.
A
be increased
B
be decreased
C
remain constant
D
either be increased or remain constant
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单选题What is the harmful effect of sulfur in a fuel?（）A
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单选题The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.A
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单选题Black smoke coming from a boiler can be caused by （）.A
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单选题Soot blowers should be used in proper sequence so that（）A
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单选题The furnace of an oil fired boiler should be （） before the operating burner is lit.A
filled with waterB
purgedC
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None of the above is true
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单选题A dazzling white burner flame in the boiler furnace indicates （）.A
no combustionB
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