2) 1000 m long great diameter borehole
千米大直径钻孔
4) great diameter perforate
大直径钻孔
1.
According to Yangquan coal miningpractice, launches the application study that the great diameter perforate substituted with the trough to traverse into technology in opening, and popularizes and applies to gas drainage from adjacent layer.
针对阳泉煤业集团某矿实际,开展大直径钻孔替代顺槽横贯成孔工艺的应用研究,推广应用于邻近地层瓦斯抽放孔的施工工程中,为高瓦斯矿的瓦斯抽放寻找一种新的技术途径。
5) large diameter regular borehole
大直径常规钻孔
6) large diameter bend borehole
大直径拐弯钻孔
1.
Drilling techniques of large diameter bend borehole which was the replacement of slant tunnel for gas discharge were researched in Yangquan.
在阳泉矿区进行了替代倾斜高抽巷的大直径拐弯钻孔施工工艺的研究,共完成6个试验孔,试验孔造斜段平均弯曲强度达到1·2°/m,钻孔总进尺378·55m。
补充资料：千米
1.公制长度单位。一千米等于一公里，合我国二市里。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条