After renovation, production capacity of cuprammonia scrubber is raised above 20 %.改造后, 铜洗塔的生产能力提高20%以上.This article reports a method of preparation of metal - copper - powder with cuprammonia by directly chemical method...
This is a Geiger counter for detecting radioactivity.这是一种盖革计数管,用来测量辐射的.A metal called uranium gave off a kind of radiation, which Marie Curie later called radioactivity.一种叫铀的金属发出一种射线, 后来玛丽·居里把这种现象称为放射性.The site was found...