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URL title:
粉笔产品展示 - 邢台市网络工程厂
URL description:
例如，5角硬币材质由钢芯镀铜合金改为钢芯镀镍，抗变色性能明显提升，正背面内周缘由圆形调整为多边形，方便特殊群体（弱视）识别。
URL keywords:
粉笔
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