The PCB NC drilling machine is key technology equipment in the PCB's precise holesite processing.
印制电路板（PCB）数控钻床是印制电路板精密孔位加工关键的工艺装备。
2
The text show the method to transact soft base under subgrade by mudjack, plane furnish, holesite, confirm pressure, deep of bore and technics flow of mudjack.
简要说明压浆法处治路基下软弱地基的方法，平面布置、孔径，确定压力、钻孔深度，以及压浆工艺流程。
3
It is no use trying to plan an 18-hole golf course on a 120-acre site if you have to ruin the environment to do it.