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单选题
某纬度圈上有两点，用该纬度上经度1’长度为单位量取其长度，所得数值为该两点间的（），用该纬度处纬度1’长度为单位量取其距离，所得数值为两点（）
A
经差；东西距
B
东西距；经差
C
经差；纬差
D
东西距；实际距离
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