VHF omni-directional range beacon 甚高频全向无线电信标
neutral directional range 空档方向范围
omni-directional range set 全向测距仪
odr omni directional range 全向无线信标
Directional Radio Range 特高频多向导航台 ; 无线电指向标
VHF Omni-Directional Radio Range 特高频多向导航台
Directional Light Shadow Range 平行光阴影范围
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