Sandstones are, as a rule , interbedded with shales.砂岩通常都与页岩互层.This paper presents the PDC bits with the satisfactory testing result in the multi - interbedded formation.介绍了一种复合式PDC钻头,该钻头在多夹层地层钻井施工中取得了较好的试验效果.A shale for...
The bike has style, it has looks, it has its little idiosyncrasies.这辆自行车品质一流，外观漂亮，有一些细节之处与众不同。Everyone has a few little idiosyncrasies.每个人都有点小嗜好。The car has its little idiosyncrasies.这辆车有它的一些小小脾气。...