属于这类物质的有云母 、 瓷器 、 石英 、 玻璃 、 木材等等.To this class of substance belong mica, porcelain, quartz, glass, wood, etc.沥清铀矿和铜铀云母比纯铀的放射性强得多.Pitchblende and chalcolite are much more radioactive than uranium itself.它不能通过云母这样的不透水的物质.I...
The Frequency Shift Keying modulation is widely used in HF digital communication.移频键控是短波数字通信中常用的一种调制方式.Her sister carried with her most of the grimness of shift and toil.她姐姐身上还带着艰辛操劳的痕迹.Before deselecting shift the selec...
Add Ferroin indicator and titrate with 0.025 N ferrous ammonium sulphate solution.加入亚铁菲绕啉离子,用滴定法测量硫酸亚铁铵溶液.The water was reacting with the ferrous iron in the tank.水与水箱中的铁质产生化学反应.Using genedifferential gene expression in ...