People used to measure the radius of nonplastic circular by the length of bowstrings in the geometric calculation .
在几何量测量中一直以高长等方法测量非整形圆弧半径值。
People used to measure the radius of nonplastic circular by the length of bowstrings in the geometric calculation .
在几何量测量中一直以高长等方法测量非整形圆弧半径值。
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