雷达设备、无线电导航设备及无线电遥控设备。
Radar apparatus, radio navigational aid apparatus and radio remote control apparatus.
飞机上的一种无线电导航设备，通过测量电波往返飞机和预选地面（DME）台之间所需要的时间来确定两者间的距离。
A radio navigational aid for determining the distance from a selected DME ground station by measuring the time of transmission to and from it.
飞机上的一种无线电导航设备，通过测量电波往返飞机和预选地面（DME）台之间所需要的时间来确定两者间的距离。
A radio navigational aid for determining the distance from a selected DME ground station by measuring the time of transmission to and from it.
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