同涂层遮盖力相关的一个数值，以相同的涂层的厚度在黑色和白色背景下涂层反射系数的比值。
A value related to the hiding power of a coating. The ratio of reflectance of the coating over black and white backgrounds at equal film thickness.
绝对值A GC 在控制同板差的同时，对目标厚度及其公差带的控制也至关重要；
Absolute AGC is important for both control of gauge in same. plate and control of tolerance hand of aim thickness.
试验表明，扫描电镜图像的质量是同喷镀导电膜的方法和厚度有着密切的关系。
Experimental results indicate that the quality of SEM image is closely related to the coating method and the coating thickness.
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