单词	备便单位
释义	同备便任务--备便单位
随便看	secondary ectoderm secondary education secondary educational branch secondary effect secondary efficiency secondary egg membrane secondary egg membrane; chorion secondary election secondary electrode secondary electrolysis secondary electron secondary-electron secondary electron conduction secondary electron counter secondary-electron counter secondary electron emission secondary-electron emission secondary electron emission coefficient secondary electron image secondary electron multiplier secondary-electron multiplier secondary electrons secondary-electron yield secondary eleventh secondary embryo