elevation accuracy
... elevated duct 架空管道 elevation accuracy 仰角精度 ellipsometer 椭圆计 ...
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RTR高空探测系统保留了无线电经纬仪的优点，增加了测距功能，具有较好的低仰角测风精度。
System of the RTR altitude detection inherits merit of the wireless theodolite , add new function of range finder and have good accuracy of anemography through lower elevation.
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