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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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（1）B
（1）and（2）C
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考题
单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.A
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1
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单选题A dazzling white burner flame in the boiler furnace indicates （）.A
no combustionB
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cold fuel oil
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