the emission of electrons from a surface that is bombarded by higher energy primary electrons
双语例句
There may be secondary emission effects that depend on theplate material. 而且还有屏极材料不同导致的二次发射现象。
In this paper the sample preparation techniques of radiolarite were discussed in order to get high quality secondary electron images in SEM. 讨论了为获得放射虫化石的高质量的二次电子图像所采用的试样制备方法。
