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.
在綜述巷旁支護技術(shù)發(fā)展歷程的基礎(chǔ)上,提出膏體材料巷旁充填沿空留巷新技術(shù); 返回 sublevel roadway