单词 | 控制棒 |
释义 | 〔hafnium〕A brilliant, silvery, metallic element separated from ores of zirconium and used in nuclear reactor control rods, as a getter for oxygen and nitrogen, and in the manufacture of tungsten filaments. Atomic number 72; atomic weight 178.49; melting point 2,220°C; boiling point 5,400°C; specific gravity 13.3; valence 4. See table at element 铪:一种锆矿中分离出来的亮银色金属元素,用于核反应堆的控制棒,可形成氧气和氮气的保护膜,还用于钨丝的制造。原子序数72;原子量178.49;熔点2,220°C;沸点5,400°C;比重13.3;原子价4 参见 element〔tetrode〕A four-element electron tube containing an anode, a cathode, a control grid, and an additional electrode.四极管:包括一个阳板,一个阳极,一个控制棒和一个附加电极的四元素电子管 |
随便看 |
|
英汉汉英双解词典收录301015条英汉双解翻译词条,可根据汉字查询相应的英文词汇,基本涵盖了全部常用汉字的英文读音、翻译及用法,是英语学习及翻译工作的有利工具。