无线广播扩音装置
radio broadcast amplifying device
有线广播扩音装置
wire-broadcasting sound amplifying device
导叶不同步装置MGV装置
misaligned guide vane MGV
广播广告发展潜力
potential development of radio ads
广播广告优势
advantages of radio advertising
群播广播封包
Multicast and Broadcast Packets
精播装置
Precision seeding apparatus