beam-angle-between-half-power-points半: half功率: power; rate of work; capacit ...点: drop间: space in between; opening的: 4次方是 The fourth power of 2 i ...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:半功率点间的束夹角，即可在微信中查询翻译
