问题
单项选择题
What does not contribute to the commercial GPS receiver position error（）.
A.Satellite clock
B.Ship's speed
C.Atmospheric/ionospheric propagation
D.Receiver
答案
参考答案：B
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What does not contribute to the commercial GPS receiver position error（）.
A.Satellite clock
B.Ship's speed
C.Atmospheric/ionospheric propagation
D.Receiver
参考答案：B