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第一步:看釉面上有无针孔、斑点,釉面的质感,有无色差。第二步:看瓷砖是否变形,测量瓷砖的两条对角线是否
The first step: to see glazed pinholes, spots, glazed texture, with or without color. The second step: to see whether the deformation of the tile, measuring two diagonal tiles is