方法将两根非吸收缝线平行固定于刻度直尺框架上，制成实验模型。
Methods The experimental model, in which two pieces of non-absorbable suture were fixed parallelly on shelves of graduated rule, was made.
本实用新型公开了一种可伸缩尺，该伸缩尺由两个滑动装配成一体的直尺组合而成，两直尺相互正对且相互平行。
The utility model discloses a collapsible ruler, which is formed by the combination of two rulers glidingly assembled into integration; the two rulers face each other and are parallel mutually.
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