secondary emission coefficientsecondary-emission ratio次级: secondary发射: launch; radiate; project; di ...系数: coefficient; ratio; modulus; ...次级发射: secondary emission次级发射管: secondary emission tube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:次级发射系数，即可在微信中查询翻译
