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.铜铀云母 ( 铜和铀的磷酸盐结晶体 ) 的放射性是铀放射性的两倍.Chalcolite ( crystallized phosphate of copper and uranium ) is about twice as radioactive as u...
Diamonds have extreme resistance to abrasion.钻石极抗磨损.Erosion of pipes and vessels from abrasion by particles can be serious.由于固体颗粒的磨蚀作用,管子和容器的磨损严重.Abrasion also abets wind erosion.磨损作用也助长了风的侵蚀....