layer mining face 分层工作面
single layer mining 单层开采
protect layer mining 保护层开采
protective layer mining 保护层开采
protection layer mining 保护层开采
thick coal-layer mining 厚煤层开采
Third, To implement layer mining in Xinxia-24 &25 formation.
将新下24层与新下25层进行分层开采；
Simulation results may bring forward reasonable Suggestions for the design of protective layer mining and relief-pressure gas drainage.
模拟结果可为保护层开采及被保护层卸压瓦斯抽采设计提供合理建议。
The system structure is a multilayer system structure with five layers. They are user interactive layer, system program interface layer, mining core service layer, data access layer, database layer.
系统使用五层体系结构，分别为：用户交互层，系统编程接口层，挖掘核心服务层，数据库访问层，数据库。
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