One carbon-coated plate, or electrode, is positive, and the other is negative.

一块碳涂层板或电极为正，另一块为负。

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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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Bottom Cover Powder Coated Steel Plate.

钢板烤漆压筋。

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Bottom Cover Powder Coated Steel Plate.

钢板烤漆压筋。

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