electiveadj.选举的;随意选择的n.[美]选修科目
elective Genesiacal选择发生
elective study dies选修科目
elective collection选择性收集
Elective Affinities亲和力
elective enrichment选择性富集
elective indemnities选择性补偿
elective irradiation选择性照射
elective low forceps选择性低位产钳
elective radiotherapy选择性放疗
elective course system选课系统