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25.12  硅质化石粗粉(例如,各种硅藻土)及类似的硅质土,不论是否煅烧,其表观比重不超过1
25.12 Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less


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