velocity-modulated beam 调速电子束 ; 速度调制束

modulated beam microdensitometer [光] 调制射束显微密度计

modulated beam photometer 调制光束光度计

time-modulated beam 时间调制束

density modulated beam 密度调制光束

intensity modulated beam 强度调制光束

frequency-modulated beam 调频光束

modulated light beam 调制光束

modulated beam of light 调变光束