["о 2年4月13号练题，回复得得D（显出后不评分D谢谢回复D
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D 以下必须进行烘炉炉D炉D炉管D火嘴D构件D新建的D炉D检修更换了炉管的加热炉D检修更换了火嘴的加热炉D更换了构件的加热炉D新建的的加热炉D
以下必须进行烘炉的是( D )。 A、 检修更换了部分炉管的加热炉 B、 检修更换了部分火嘴的加热炉 C、 只要更换了构件的加热炉 D、 新建的加热炉
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