x ray source造句

• It is almost the case that each x ray source exhibits its own brand of variability .
  几乎每个x射线源都有自己的变化特点。
• For some of those x ray sources , no visible counterparts can be seen in optical range
  当中一些x射线源，用光学望远镜竟无法看见它们对应的物体。
• Using field emission cathode , x ray source can be made with several advantages : smaller volume and brighter , high frequency response , in - time turning on , etc . considering of the merits and potential markets , researching and fabricating miniature x - ray source is meaningful
  由于突起数目大且尖端顶端电场强度高，因此产生很大的场发射电流密度。采用场发射阴极的x射线光源具有体积小，辐射强度高，频率响应快，可以随时开启，无需预热的优点。