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测绘方面的 闭合导线计算问题

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7
837.140      253.090
101.1324     212.0536
107.4906     233.90
128.5818     275.62
142.5030     184.39
121.0624     256.74
 79.2824     179.83
209.4442     252.04
110.0300     228.54