Purpose To establish a screen film system sensitometric method of X ray scale exposure by changing the distance between focus and film.
目的建立以焦点胶片距离的改变，取得X线阶段曝光的屏片体系感光测定方法。
Tap the screen to focus on certain distance and make objects in other distances become blurry.
点击屏幕把重点放在一定的距离，并在其他距离的物体变得模糊。
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