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【单选题】
某GPS网采用某型号的GPS接收机指标为:固定误差为3mm,比例误差为2ppm,对于一条2km的基线,则该基线长度的中误差为( )。A.
4mm
B.
3mm
C.
2mm
D.
5mm
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【单选题】下列内容不属于感知集合的内容是
A.
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B.
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C.
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D.
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