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
更多“What does blowing tubes accomplish?（）”相关的问题
A、A. What does “chi shui” mean in English? B、B. What does “chi shui” stand for? C、C. What’s “chi shui” in English?
A、He's good at fixing things. B、He can speak good German. C、He does the washingup after supper D、He's a language teacher.
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