photoemissive cellphotoemissive tube光电放射: electronogen管: pipe; tube光电放射的: photoemissive光电放射体: photoemitter光电放射阈: threshold of photoemission下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:光电放射管,即可在微信中查询翻译