2022年5月31日
china
摘要： china clay (=kaolin) is a fine clay used in ceramics and refractories [陶瓷和耐火材料], as a filler or coating for paper and textiles, as an additive in food 阅读全文
posted @ 2022-05-31 22:35 华容道专家 阅读(66) 评论(0) 推荐(0)