promethium
基本解释
- n.[化]钷（稀土金属元素；符号 Pm；原子序61）
英汉例句
- My father found that promethium orb 20 years ago...
我父亲在20年前找到的这颗珠子... - The heat stabilities and transparencies of stearates of rare earth metals except scandium and promethium used as heat stabilizers as PVC were studied.
研究了钪、钷外其他稀土金属硬脂酸皂对PVC热稳定作用。结果表明:它们均属长期型热稳定剂,与少量硬脂酸锌并用可有效改善其抑制PVC初期着色的效能; - The discovery of prometheum is presented in detail and emphasis is put on the important role of the ion exchange method in separating and identifying promethium.
本文详细及正确地介绍了放射性元素钷的发现史,特别强调了离子交换技术在钷的分离及鉴定中的重要作用。 - Keywords promethium;aquatic ecosystem;dynamics.;
钷;水域生态系;动力学;