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關(guān)于圖紙?jiān)O(shè)計(jì)和機(jī)械加工經(jīng)濟(jì)性問題 |
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點(diǎn)評(píng)
這種主要針對(duì)的是劃線做的,劃線的誤差是有可能超差的
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