被攻牙材料; Workpiece materials 被攻牙材料; Workpiece materials 被攻牙材料; Workpiece... 低碳素鋼 Low Carbon Steels ≦C 0.2% 中碳素鋼 Medium Carbon Steels C 0.25≦0.45% 高碳素鋼 High Carbon Steels ≦C 0.45%
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