@被谱绵合析 TTH problem 12 IR spectrum (liquid film) u1705 RLLL 4000 3000 2000 i600 1200800 V(cm pass pece=u l UV spectrum i 104 1 mg/10 ml EtOH 99M:114 i 0.2 cm cell 04060801001200如180200220202003002054200250 ni/e