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14 wall charts (GB/T9441-2021)
Wallchart of the Ink Casted Iron Gold Rating Standard(GB/T9441-2021)14Chang.
1.Globrate Rating Chart （1-6级）
2.石墨颗粒评定对比图
3.graphite particle size rating（3-8Level）
4.Rating chart for beads
5.Phosphorus co-clinics rating map
6.Rating of carbon content
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