2551| 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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