For bedrock drilling ordinary hard alloy driller can be adopted for vertical core-drilling with the addition of clear water during rotation. for overburden dry drilling process can be adopted.
基岩钻探方法以采取普通硬质合金清水回转垂直取心钻进，覆盖层采用干钻。
2
The evidence comes from everything from coredrilling to medieval financial records newly uncovered from state archives in Istanbul and Italy.
所展示的证据来源广泛，从岩心钻探到在伊斯坦布尔和意大利的国家档案馆新发现的中世纪财政记录。
3
Diamond coring bits are utilized for coredrilling.