单选题（） will be used to blow away soot and the combustion products from the tube surfaces.AThe blow down valveBThe scum valveCThe air release cockDScot-blower
单选题
（） 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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