Difficulties are encountered in drilling in boulder formation are efficiently eliminated by using of a combined drilling technique which combines casing drilling with DTH drilling method.
本文介绍的采用套管鉆进和潜孔锤鉆进相结合的复合性鉆进工艺,有效地解决了在卵砾石层中鉆进的难题。
Simple one-step biotansformation of IR3535 TM leads to the immediate formation of a polar metabolite which is efficiently eliminated from the body without further conversion.