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。
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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