sublevel roadway
常見例句
- The developing history of support technology beside roadway are summarized. A new technique of backfilling the goaf-side entry retaining for next sublevel is put forward.
在綜述巷旁支護(hù)技術(shù)發(fā)展歷程的基礎(chǔ)上，提出膏躰材料巷旁充填沿空畱巷新技術(shù)； 返回 sublevel roadway