题目内容（请给出正确答案）

[主观题]

Too much air in the furnace of an oil-fired boiler would be indicated by _____.A.yellowish

Too much air in the furnace of an oil-fired boiler would be indicated by _____.

A.yellowish flame

B.golden yellow flame

C.white flame

D.brilliant white flame

提问人：网友szs1860 发布时间：2022-01-06

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