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......

The copolymerization of DL-LA and 3-BMG was carried out in bulk with stannous 2-ethylhexanoate as the catalyst. A series......

以β-环糊精（β-CD）为接枝骨架、DL-丙交酯（DLLA）为接枝单体，三乙胺为催化剂，合成了β-环糊精，聚（DL-丙交酯）接枝共聚物（PCDLA）．利用IR、^1H-NM......