（） will be used to blow away soot and the combustion products from the tube surfaces.<br>A:The blow down valve<br>B:The scum valve<br>C:The air release cock<br>D:Scot-blower

（） will be used to blow away soot and the combustion products from the tube surfaces.
A:The blow down valve
B:The scum valve
C:The air release cock
D:Scot-blower

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