...机如菲利蒲或映美精等，后焦(Back Focus)距离只要十多毫米而已，小数型号目镜也是，但大多数目镜都是负后焦(Negative Back Focus)，即焦平面是望远镜调焦筒或天顶镜内就可以了。注意阻隔滤镜本身也是一个天顶镜。
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后焦面上的频率分布还原成像面上的光场复振幅空间分布。
The space frequency distribution on rear focal plane restores to the distribution of complex amplitude on image plane.
对煅后焦的吸附热力学进行研究，表明此吸附过程为物理吸附。
Through the analysis on the adsorbent thermodynamics of the calcined-coke proved that the process of this adsorption is physical adsorption.
印度尼西亚煅后焦客户，有详细规格。做这个的可以回复一下。
Hai there, my name is Joel from Indonesia. My company have need for this chemical, the specification is.
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