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...
Sixth , the mechanism of drift instability based on physical interpretation of GKS stability criterion is remarked.对基于GKS定理多次透射公式飘移失稳机理的解释作了进一步的注记.Lack of water perpetuates poverty, increases the risk of political instab...
Are no probabilities to be accepted merely because they are not certainties?难道仅仅由于事情不具备必然性,我们就不承认它们也有或然性?But DNA experts still deal in probabilities and not certainties.但DNA专家们分析的是可能性,而不能明确断案.Therefore, individual - pref...
史密斯和约翰同时被提名授予一等奖.Smith and John were bracketed for the first prize.马克被提名为司库.Mark is the nominee for Treasurer.埃玛被提名为司库.Elma was the nominee for Treasurer....
Always buy from a reputable dealer.购买商品时一定要选择信誉良好的贸易商.We prefer to deal only with reputable companies.我们只喜欢和有声誉的公司打交道.You are well advised to buy your car through a reputable dealer.强烈建议您通过值得信赖的经销商购车。...