Warning: file_put_contents(): Only 0 of 6423 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/oclz.com/index.php on line 55 berkelium英英字典_berkelium剑桥英语解释_berkelium柯林斯英文解释_菜篮子兴趣思朗文词典
1. N a metallic transuranic element produced by bombardment of americium. Symbol: Bk; atomic no: 97; half-life of most stable isotope, 247Bk: 1400 years; valency: 3 or 4; relative density: 14 (est) 錇