在溶剂提取法中黄酮类化合物最常用的提取溶剂是A.氯仿 B.甲醇和乙醇 C.乙酸乙酯 发布时间:2018-07-06 08:18 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在溶剂提取法中黄酮类化合物最常用的提取溶剂是A.氯仿B.甲醇和乙醇C.乙酸乙酯D.丙酮E.乙醚
题型:单项选择题 Passage TwoWhat else should you do when you squat down to lift a heavy object A.Put your knees in front of the object.B.Keep your legs straight and forward.C.Get as close to the object as possible.D.Bend over the object from your waist. 查看答案