What does blowing tubes accomplish?（）<br>A:Eliminates unburned fuel oil residues from the firebox<br>B:Increases boiler efficiency<br>C:Flushes away mineral deposits inside the water tubes<br>D:Cleans soot deposits from the inside of the stack

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

出自：海船船员证

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