单选题When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.A10 metersB20 metersC50 metersD100 meters
单选题
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
A
10 meters
B
20 meters
C
50 meters
D
100 meters
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