外径千分尺的测量值已经到0.01mm,
而一根粗点的头发都有0.06mm.
所以你完全可以一张直接测了,
把纸放在千分尺的测量面间然后然后转动棘轮,当纸被夹住后再转3-5次后就可以读数了,多测几次取平均值
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