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卷尺头为什么是松的
更新时间: 2020-09-25 00:00:00  

因为卷尺可测量两类尺寸:外尺寸和内尺寸,为使测量准确,头部设计为松动。

测量外尺寸时,如桌面长度,卷尺头勾住桌边缘测量,此时卷尺头因拉伸而在最外侧。

测量内尺寸时,如室内距离,卷尺头顶住墙边测量,此时卷尺头回缩到最内侧。

关键词: 卷尺 为什么

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