The state of Texas is the largest in area of all the states in the U.S（）
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Which one is not included in the three main functions of GNSS（）
A. Positioning
B. Navigation
C. Timing
D. Photograph
“World Geodetic System，WGS-84” is an international space coordinate system standard（）
“1∶500” is a small map scale（）
People is a part of composition of GIS（）
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