单选题The furnace of an oil fired boiler should be （） before the operating burner is lit.Afilled with waterBpurgedCcleared of airDNone of the above is true
单选题
The furnace of an oil fired boiler should be （） before the operating burner is lit.
A
filled with water
B
purged
C
cleared of air
D
None of the above is true
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