11544| 41
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大家看看我課程設(shè)計的轉(zhuǎn)盤 |
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點評
外六角螺栓能否換成12.9級的內(nèi)六角螺栓,?強度會不會更好些,?外觀會不會好看些?裝配會不會方便些,?
評分
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