User communities worldwide involved in, for example, disaster management, environmental monitoring, geomatics, precision agriculture, resource conservation, surveying, mapping, transport and timing are becoming increasingly convinced of the need to develop GNSS that provide a safer, more reliable navigation and positioning service for civil use.
在 此?? 叶 辛 有? 点 小? 礼 物 要? 给 你UN-2 UN-2