Sublevel
美 [sʌb'levl]英 ['sʌb'levl]
- n.分段;中间平巷;副准位;次层
- 网络次能级;次级;预备级

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Supporting Techniques of Preparation Roadway for Fully Mechanized Sublevel Caving in the Easily Spontaneous Combustion Coal Seam
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Application of Spontaneous Fire Prevention Technology in Withdrawing Faces of Full-mechanized Sublevel Caving