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1.knife edge
2.chi, a unit of length (=1/3 metre)
3.slide rule;
4.a logarithmic scale
5.bronze paperweight
6.flexible measure made of bamboo slat
7.folding rule
8.Luban scale
鲁班真收藏指正
9.linear scale
10.stand six feet
身长六收藏指正
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