您要查找的是不是：
- The first of the British advantage was the development of High Frequency Direction Finders (HD/DF or “huff duff”) for shipboard use. 英国首先的优势是装备在甲板侧弦的高频方向定位仪（HD/DF）。
- High and very high frequency direction finding 高频和甚高频测向仪
- Medium-high frequency direction finding station 中高频测向台
- very high frequency direction finding 甚高频测向
- very high frequency direction finder 甚高频测向器
- medium frequency direction finder station 中频测向站
- High Frequency Direction Finding Systems 高频方向寻找系统
- high frequency direction changing ratio 高频换向
- High and Very High Frequency Direction Finder 高频和甚高频定向仪
- High Frequency Direction Finding 高频测向
- Medium and Very High Frequency Direction Finder 中频与甚高频测向器
- high frequency direction finding station 高频测向台
- medium frequency direction finding 中频测向
- medium frequency direction finder 中频测向器
- Medium and High Frequency Direction Finding Station 中、高频测向站
- He varied the transmission frequency. 他变换了无线电传送的频率。
- Medium High Frequency Direction Finder 中高频测向器
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- Ultra High Frequency Direction Finder 特高频测向仪
- ultrahigh frequency direction finding 特高频测向
