单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.Acheck and regulate the water levelBclose the air cock once fires are litCblowdown the gage glassDcrack the steam stop to assure protective steam flow
单选题
Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.
A
check and regulate the water level
B
close the air cock once fires are lit
C
blowdown the gage glass
D
crack the steam stop to assure protective steam flow
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