The employment of dip retreat and wedge pipe bolt for roof support showed that the permissible exposed area of mine goaf increased from 50m2 to 258-500m2, thus greatly reduced the ore loss and dilution.
本文以理论研究为基础,密切结合生产实际,采用沿倾斜后退式回采顺序和楔管式锚杆护顶技术,使采空区允许暴露面积只有50m~2左右,扩大到258～500m~2,大幅度地降低了矿石损失与贫化,获得显著的经济效益。
retreating mining method
后退式开采法(采矿)
Three Anti-Measures for Strike Longwall Retreating Mining In Sloping Coal Seam
倾斜煤层走向长壁后退式采煤法的三防措施
The crowd stood back and let the ambulance go.
人群退后让救护车开走。
He plans to keep a pub when he retires.
他打算退休后开酒馆.
No refunding after it is opened.
打开以后就不能退款了。
STUDY ON OPTIMIZING MODES OF LAND AND WATER RESOURCES EXPLOITATION ATFER RETURNING FARMLAND TO FOREST AND GRASSLAND IN ARID AREA OF NORTHWESTERN CHINA;
西北干旱区退耕还林(草)后水土资源开发的优化模式研究
If we had taken no action and backed down, we would only have had more trouble down the road.
如果不采取措施，我们后退了，以后麻烦会更多。
Shortly after Rogge spoke, the flame-lighting ceremony and torch relay were targeted by protesters.
在罗格接受采访后不久，奥运会的圣火采集仪式正式开始，但期中遇到了一些抗议者。
The crowd bore back so that the ambulance could pass.
人群向后退开，让救护车可以开过去。
Then we started to prepare for New Years.
然后就开始采办年货。
At the rest of this article, we emphasize some key problems in the near future study of the distributed data mining.
最后 ,提出了分布式数据开采中一些重点研究问题 .
We also analyze the particular characters that a well formed distributed data mining system should have in its architecture.
随后分析了分布式数据开采系统的体系结构应该具有的特点 .
multiple opening-and-closing plankton sampler
复式开闭浮生物采样器
high-face room-and-pillar mining
高工作面房柱式开采
advance workings
长壁前进式全面开采法;超前巷道;前进式开采面
open-end method
(采矿) 敞开进路式矿柱回采法
After he retired from the army, he took up writing.
他从军队退役以后便开始从事写作。
Once started there is no going back.
一旦开始之后，就再也没有退路了。