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...
目的提出甘肃省地方性氟中毒防治对策.Objective To propose suitable prevention measures for endemic fluorosis.结论适当浓度的碘、对大鼠氟中毒有明显的拮抗作用.Conclusion Proper concentration I and Se have obvious antagonism against rat fluorosis.此外,贵州还有超过1000万人有氟中毒...
'That's much too subtle, even for Sam.' — 'Even for Sam!' He pounced on the phrase with a sound of triumph.“那太微妙了，即便对萨姆来说。”——“即便对山姆来说！”，他得意洋洋地抓住了这句话。Spring's real harbingers are too subtle f...
In order to strengthen corona effect, arista electrode used as substitute for grid electrode was presented.为了加强电极电晕效果, 提出了用芒刺电极代替栅网电极.A triangular metal bracket used to strengthen a joist.用于加固托梁的金属板.And they will have to...