@被谱合解析一 problem 7 oestrum (liquid film) LI.:LL⊥:1 4000 3000 2000 1600 12c0 104 ha2s4pect二u 79 107 UV spectrum 5.815 mg/10 ml EtOH 122CsH100 I cm cell 58.4 01246180402040260"28"JJ2340 00