radiodust放射性灰尘radion.收音机；无线电v.用无线电通讯radio and telephone control无线电及电话管制radio-controlled aircraft无线电控制的飞机radiotelegraph alarm signal无线电报报警信号radio determination station无线电测定台radiopharmaceutical therapy放射药物治疗radioisotope brain scanning脑放射性核素扫描检查radio launch control system无线电发射控制系统radio research organization无线电研究组织radio research laboratories电波研究所radio frequency spectrocopy射频频谱学