单选题The forced draught fan should be started and air passed through the furnace for several minutes to “（）” it of any exhaust gas or oil vapors.AblowBcleanCscavengeDpurge
单选题
The forced draught fan should be started and air passed through the furnace for several minutes to “（）” it of any exhaust gas or oil vapors.
A
blow
B
clean
C
scavenge
D
purge
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