Comets consist of “ dirty ice ” , rather than solid rock , and so contain little iridium 彗星是由“脏冰”所组成，而不是像小型那样由固体岩石组成，所以只含有少量的铱。
It deployed two iridium satellites for global satellite phone communication in 1997 . long march 2f launch vehicle 该火箭于一九九七年发射两枚用作全球卫星电话通讯的铱星系统卫星。
The standard for the kilogram is a platinum - iridium cylinder kept at the international bureau of weights and standards in sevres , france 千克的标准是指置于法国塞夫勒的国际度量及标准局的白金铱圆柱为准。
Methods for analysis of noble metals in geochemical samples - determination of iridium content - preconcentration by thiourea - catalytic spectrophotometric method 地球化学样品中贵金属分析方法硫脲富集-催化分光光度法测定铱量
There is no key technology hard to master , let alone any need to make use of iridium satellite launches for improving china ' s mirv technique 不存在任何难以突破的关键技术，更谈不上利用发射铱星来提高中国多弹头的分配器技术。
Scientists subsequently found enhanced iridium levels at more than 100 end cretaceous sites worldwide and shocked quartz at more than 30 sites 世界各地的白垩纪末期遗址中，科学家发现了超过100处有铱含量高得异常的层位，采集到变形石英标本的遗址也超过30处。
Industrial radiography . determination of the speed and average gradient of film - based image receiving systems for use in the energy range from 300 kev to 1 , 5 mev with iridium 192 工业放射学.能级从300kev至1 . 5mev的铱192用底片图象接收系统感光度和反差平均值的测定
The iridium layer commonly used to support catastrophism fits into this theory as evidence for the extreme volcanism that would have been produced by the eruption of larasia and gondwana 至于那个支持灾变说的铱异常层，则可能是拉拉西亚和冈纳德万喷发时特别强大的火山作用的产物。
Most platinum jewelry is 95 percent pure platinum , and 5 percent iridium or palladium alloy . for guaranteed quality in platinum , look for the marks 950 plat or plat Pt950含钯、铑、铱5 % ，硬度仍然相对较低，一般用于素铂金首饰； pt900含钯、铑、铱10 % ，硬度对镶嵌饰品来说恰到好处。
The research status and progress in the coupling methane partial oxidation and carbon dioxide reforming reaction including the catalysts used for the reaction are described and discussed 摘要对耦合甲烷部分氧化与二氧化碳重整反应的研究现状和进展及用于该反应的铱、镍、钴、铂等催化体系进行了介绍和探讨。
