短語詞組短語ehf extremely high frequency 超高頻率;極高頻extremely high frequency band 極高頻帶Extremely high frequency wave 極高頻電磁波extremely high frequency propagation [電子]極高頻傳播Advanced Extremely High Frequency 先進(jìn)極高頻;先進(jìn)極高頻衛(wèi)星;高級超高頻advanced extremely high frequency satellite 極其先進(jìn)的高頻衛(wèi)星 返回 extremely high frequency