久久久久国产精品人妻aⅴ网站,今天高清视频在线观看,极品人妻videos人妻,国模吧一区,二区三区,精品久久久久久国产,亚洲a精

Project Introduction: Applied in Ciwu Mining in Shangrao, with ore hardness of F9-F11 and developed joints in some areas.

Construction Efficiency: Single-hole drilling depth of 20-30m, average pure drilling speed of 1.8m/min per hole, average rod changing time of 10-20s per rod.