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本文探讨了各种曲忻形线形锁的最弱边及中点精度，文中指出三角形的圆形必须良好， 尤其是求距角及传距角不能过小，否则影响锁的精度较大。 当曲折形线形锁偏离角θ较大时，或线形锁中点偏离大基线较大的，平差时应考虑用严 密平差法，以增进线形锁的精度。 在文中并探讨了Ｗ形线形锁与Ｓ形线形锁的精度，两者大约相同，亦即是说线形锁偏离 大基线的两边与一边锁的精度基本相同。
In this paper, we discuss the weakest edge and the midpoint accuracy of various curved Xin line locks, pointed out that the circle of the triangle must be good, especially for the pitch angle and the transmission angle can not be too small, otherwise the accuracy of the lock is greater. When the zigzag linear lock large deviation angle θ, or linear lock large deviation from the large baseline, the adjustment should be considered with the tight adjustment method to improve the linear lock accuracy. In this paper, the accuracy of W-shaped and S-shaped linear locks is discussed, which is about the same. That is to say, the precision of the two sides and one side of the linear lock deviating from the large baseline is basically the same.