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25.20 生石膏;硬石膏;熟石膏(由煅烧的生石膏或硫酸钙构成),不论是否着色,也不论是否带有少量促凝剂或缓凝剂:
25.20 Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulphate) whether or not coloured, with or without small quantities of accelerators or retarders:


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