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| 空/地远程通信; facility空/地远程通信设备 (无人操作的甚高频/特高频 (VHF/UHF )收发设备，用来扩大航路交通管制中心 (ARTCC )的空对地通信覆盖范围,并方便飞行员和管制员之间的直接联系。空/地远程通信设备有时并未配有121.5 MHz或243 MHz 的应急频率) | |||
| remote communication air/ground: 2 phrases in 1 subject |
| Aviation | 2 |
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