英文：An electrode used in certain electron tubes to provide secondary emission.
中文：中间极，二次发射电极一种用于一定电子管作第二次发射电极
英文：The number of electron pairs an atom can share with other atoms.
中文：共用电子对数，共价一个原子与其他原子共用的电子的对数
英文：A particle, such as an electron, a proton, or a neutron, having half-integral spin and obeying statistical rules requiring that not more than one in a set of identical particles may occupy a particular quantum state.
添加新评论