Meteorological experts in Beijing are testing an unmanned mini-plane before finally using it as a new regional weather-monitoring device.The 1.8-metcr-long plane weighs about 10 kg, and was designed...
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Meteorological experts in Beijing are testing an unmanned mini-plane before finally using it as a new regional weather-monitoring device.The 1.8-metcr-long plane weighs about 10 kg, and was designed...