已知一混合物含有对二甲苯，间二甲苯，邻二甲苯和乙苯，测定不同的波长时，混合物吸收度给出，比给出各化合物的摩尔吸收度，设在测定的范围内符合比耳定律，计算该混合物种各组分含量-Given a mixture comprising p-xylene, m-xylene, o-xylene and ethylbenzene, measured at different wavelengths, the absorption of the mixture is given, the molar ratio