螺旋甾烷型皂苷的结构特征有 螺旋甾烷型皂苷的结构特征有A.B/C和C/D环反式稠合 B.A/B环反式也有顺式稠合 C.C-20位的甲基为β构型 D.C-20位的甲基为a构型 E.C-25位 分类:英语四级 题型:填空题 查看答案
Who did the speaker think Milly was when she saw the farmer? Who did the speaker think Milly was when she saw the farmer?A.The farmer's secre 分类:英语四级 题型:填空题 查看答案