电磁波是由一种称为速调管的微波电子管产生的.The electronmagnetic wave is produced by microwave tubes called klystrons.这些工厂生产电子管 、 晶体管 、 收音机和电视机.These factories produce tubes, transistors, radio sets and TV sets.这些放大器是用微型电子管制成的.These amplifier...
She produced still lives and landscapes but above all moody yet incisive portraits of her mother, local school girls, women workers in town (profiles of a pensive, aristocratic looking seamstress dressed in black stand o...