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BF2锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷鄢锟斤拷锟�270目石英砂锟斤拷锟斤拷学锟缴凤拷
锟斤拷学锟缴凤拷锟斤拷锟斤拷锟劫凤拷锟斤拷锟斤拷%SiO298.5锟斤拷99.5Al2O30锟斤拷1FeO0锟斤拷1NaO0锟斤拷1CaO0锟斤拷1MgO0锟斤拷1TiO0锟斤拷1KO0锟斤拷1锟斤拷锟斤拷锟斤拷失锟斤拷1050锟芥)0.1锟斤拷 |