In other words mineral substances which are found on earth must be extracted by digging , boring holes , artificial explosions , or similar operations which make them available to us 换言之，地里被发现的矿物质必须经挖掘、钻孔、人工勘探或类似的操作程序，才可以为人类所利用。
Abstract : it analyses design of boring hole , possibly designs a sort of boring hole clamp , it is made simply and used easily , it has given a good effect in producing practice 文摘:分析了镗孔工艺方案可行性，设计了一种镗孔夹具，夹具制造简单，使用方便，在生产中取得很好效果。
Technology : technology to ensure small molded products with high precision in terms of bored holes , circularity , cylindricity , centering between two holes , parallelness and torsion . a lineup of specialized machinery and general purpose machinery 特殊技术:拥有在小件异型品上开孔，测量孔精度真圆度圆筒度两孔芯间平行扭弯精度的专用机跟通用机。
In this paper , technology for water injection by long bore hole in fully mechanized mining face was studied , relevant experience and some parameter were acquired , which provide a reference for using this method in similar faces 以郑州矿区典型的“三软”煤层综放工作面为对象，试验研究了长钻孔注水防尘技术，取得了“三软”煤层长钻孔注水经验和参数，为郑州矿区类似条件的工作面推广该方法提供了参考。
Abstract : in this paper , technology for water injection by long bore hole in fully mechanized mining face was studied , relevant experience and some parameter were acquired , which provide a reference for using this method in similar faces 文摘:以郑州矿区典型的“三软”煤层综放工作面为对象，试验研究了长钻孔注水防尘技术，取得了“三软”煤层长钻孔注水经验和参数，为郑州矿区类似条件的工作面推广该方法提供了参考。
5 . there are 979 . 32 meter long to the curtain of the xiangshuiriver reservoir include 879 . 32 meter " s long double row curtain ( about 92 percent ) in the original design . by optimizing the design according to the grouting test , the double row curtain was cut down to 245 . 66 meter length ( 25 per cent of them ) , the density of the bore hole have from 0 . 81m / m2 reduced to 0 . 64m / m2 . total save 4 . 47 million rmb cost of the project 5 、在总长为979 . 32m长的帷幕段中，初设批复方案的双排帷幕总长为879 . 32m ，占帷幕总长的92 % ，根据灌浆试验研究成果优化设计后，双排帷幕长度减少至245 . “ m ，仅占帷幕总长度的25 % 。
Consequently , we can conclude that the machining center ' s synthetical precision has the directive connection with the outline precision of the practical machining workpiece , thereout , separately establishes the different guidelines - milling surface ( including groove ) , boring hole and three dimensional outline machining precision , which correspond to the main machining types of the inspected machining center 从而可得出与实际加工零件的型面轮廓精度直接对应的加工中心综合精度，并由此分别确立与被测加工中心主要加工类型?铣面(含沟槽) 、镗孔和三维轮廓加工等加工精度相对应的加工中心精度的判别指标。
Many bore holes in shuangwangcheng reservoir which lies in the sedimentary area are drilled and lots of terra drill data are collected . five typical sections , i . e . section i ? i , ii ? i , iii ? ii , iv ? v ' and v ? v are drawn . the vertical sedimentary sequence of this sedimentary area is divided cbmbining the granularity features of sediments 课题组与山东省水利勘测设计院合作，对湖区内的双王城水库进行了钻探研究，搜集了大量的地质钻孔资料，经沉积物岩性特征分析，绘制出双王城水库外围1km处围绕水库的5个典型剖面(即剖面? ’ 、 ? ’ 、 ? ’ 、一’和? ’ )的剖面图，结合沉积物粒度特征，划分出该沉积区的垂向沉积序列。
