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| drill spacer block (隔垫在工件或组合件的相邻两弯边的垫板，具有引导钻头的结构。起保证平行的作用，通常先以一弯边钻好的孔作为垫板定位孔，后再在另一弯边钻出同一轴线的孔) | |||
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