钻头必须缓慢转动，以保证钻孔平整光滑。The drill should be slowly rotated to ensure a clean hole.打钻和提钻时要保持钻头平稳。Keep the drill steady while it ascends and descends.你得拆开这个钻头。You'll have to disassemble the drill....
利用空化喷咀来产生“空泡”是获得“空化水射流”的简便方法.Some jets pulsed jet , cavitating jet, abrasive water jet are introduced.磨料水射流的性能主要取决于磨料颗粒的冲击速度.The performance of abrasive waterjet depends on the impact velocity of abrasive.在低速射流的预混火焰和扩散火焰...