发布时间:2025-01-28 00:17:27
用膨胀螺丝2个,一边一个,打入墙里,留出螺丝纹,把门牌钻孔2个一边一个,上到需要放门牌的地方,拧紧螺丝。这样又结实,又耐用。
立交桥和铁路高架桥桥墩那里为什么要用钢铁顶起来这样受力面积不是更小吗
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