third order triangulation
...仪 third order plotting instrument 三等三角 测量 third order triangulation 三等三角点 third order triangulation station ..
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短语
三等三角点
third order triangulation station
;
third order triangulation station west bank
;
Station third order triangulation
三等三角测量
tertiary triangulation
;
Triangulation third order
三边都相等的三角形
equilateral triangle
等腰三角形三线合一
BC
;
BD
;
BAD