(5﹣x)2解得:x=∴EN=,AM=DN=②如图3中,取AB的中点O,连接ON,OC.理由三角形的三边关系解决问题即可.[详解](1)证明:如图1中,∵BA=BC,∠ABC=90°,∴∠BAC=∠ACB=45°,∵线段AB绕点A逆时针旋转90°得到线段AD,∴∠BAD=90°,BA=AD,∴∠FAD=∠FAB=45°,∵AF=AF,∴△FAD≌△FAB(SAS),∴...
Acacia stem bark squentially extracted (2.0 kg 7 days maceration method) Hexane extract Chloroform extract Ethylacetate extract Methanol extract Aqueous extract Partition with H2O and combined with the aqueous extract Freeze dry under vaccumat -55 oC Dry crude tannin Figure F1i.gSuereq u1...
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Photographers: 1988 Arjen & Jerrine Verkaik/SKYART Relatively transparent cirrostratus fibratus clouds oc- cur mostly in winter and often produce a halo effect around the sun or moon. Thickening cirrostratus frequent- ly indicate the approach of a frontal system. POSTAL BULLETIN 22137 (9-16-...