... ruling grade 限制坡度 pen ruling 直线笔划线 area ruling 面积律的应用...
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... 笔划写入 stroke writing 笔划边缘 stroke edge 笔划线 pen ruling ; pen scribe ...
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pen ruling machine 划线机
cross joint ruling pen 滑片墨线笔
automatic ruling pen 自动划线笔
ruling pen [测] 直线笔
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Pen ruling: Method of producing ruled sheets with a set of pens, under which the sheet travels.
笔划线：用一排钢笔在移动的纸上画上平行线条的方法。
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