介绍了外火箱矩形竖窑进火孔改造前的使用情况以及改造的必要性；
This article introduces the application of fire entry hole of rectangle kiln with outer fire box before reconstructing and the necessity of reconstruction.
介绍了外火箱矩形竖窑进火孔改造前的使用情况以及改造的必要性；
This article introduces the application of fire entry hole of rectangle kiln with outer fire box before reconstructing and the necessity of reconstruction.
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