单选题What does blowing tubes accomplish?（）AEliminates unburned fuel oil residues from the fireboxBIncreases boiler efficiencyCFlushes away mineral deposits inside the water tubesDCleans soot deposits from the inside of the stack
单选题
What does blowing tubes accomplish?（）
A
Eliminates unburned fuel oil residues from the firebox
B
Increases boiler efficiency
C
Flushes away mineral deposits inside the water tubes
D
Cleans soot deposits from the inside of the stack
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