@红外拉曼光谱 邻二甲苯 A 400 HAVENUMB ERI-II A3008 芳环C-H B1605,1495,1466C=C C742 芳环C一HC H C C A 3008 C H B 1605, 1495, 1466 C 742 芳环 芳环 邻二甲苯 A B C