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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......
Melamine-formaldehyde resin supported H~+ is used as an efficient catalyst in the Pechmann condensation reaction of phen......
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Melamine-formaldehyde resin supported H+ is used as an efficient catalyst in the Pechmann condensation reaction of pheno......
