China\'s oil import dependence had risen to 72 ％ in 2017,while its net imports of various oil products,including crude ......

柑桔皮精油用ＫＯＨ皂化，用无水乙醚提取不皂化物，蒸去乙醚，残渣用无水乙醇溶液，超滤后取清液注入高效液相色谱仪，以反相柱分离，紫外可见分光检......