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为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......
Synthesis of some new bis-3,4-dihydropyrimidin-2(1H)-ones by using silica-supported tin chloride and
Silica-supported tin chloride and titanium tetrachloride were prepared by the reaction of tin chloride and titanium tetr......
