A.1-3% B.2-5% C.4-10% D.12%
A.3% B.1.5% C.0.5% D.0.05%
A.分離效果降低,塔頂冷回流增加 B.分離效果降低,塔頂冷回流減少 C.分離效果提高,塔頂冷回流減少