2356| 7
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φ10-φ6.8的同軸度是多少?φ12-φ7.8的同軸度是多少?如下圖 |
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點評
嗯。螺釘自已把自已擰緊,還要把螺釘頭都沉進(jìn)去,不顯出坑來。。。。。那干嘛要挖這個孔呢,上螺絲有啥意義?
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