The coded signal is received by satellite dish aerials.编码信号由碟形卫星天线接收。Dish aerials are highly directional.碟形卫星天线的定向性非常强。Are the ship's main radio transmitter aerials earthed and radars switched off?液货船上主无线电发射机天线已接地且雷...
Are the ship's main radio transmitter aerials earthed and radars switched off?液货船上主无线电发射机天线已接地且雷达已关掉?Dish aerials are highly directional.碟形卫星天线的定向性非常强。...the radio aerials of taxis and cars.出租车和轿车的无线电天线The coded sig...