2431| 7
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φ10-φ6.8的同轴度是多少?φ12-φ7.8的同轴度是多少?如下图 |
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点评
嗯。螺钉自已把自已拧紧,还要把螺钉头都沉进去,不显出坑来。。。。。那干嘛要挖这个孔呢,上螺丝有啥意义?
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