楼主: loveskycc
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请教:为什么传统加工工序中攻丝或者打孔都要先钻模预打孔 |
发表于 2017-12-20 16:38:05
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发表于 2017-12-20 16:59:57
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发表于 2017-12-20 20:09:49
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