发布时间:2025-01-21 09:20:29
你这个4.5*4.8是什么尺寸,描述清楚,或许我可以帮你。需要知道的是楼梯洞的长度,宽度,以及到楼板层的地面标高。
加工Φ30的孔要经过钻扩粗铰精铰这几步要用到什么刀具刀具规格是
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