A photographic plate or a piece of film so exposed.
感光胶片或底片的曝光的行为。
Some distance above the lead block a photographic plate is placed.
在铅块上方某一距离处放一照相底板。
First, a photographic plate is coated with a light-sensitive material.
首先，把一个照相底片覆盖上感光材料。
First, a photographic plate is coated with a light-sensitive material.
首先，把一个照相底片覆盖上感光材料。
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