发布时间:2025-02-07 08:13:25
有危险,玻璃上铺木板,减少单面面积应力,把力量分散就行了,一块块的洗
自制升降机用槽钢或是用圆管焊接成高2米长宽13米的矩形上方固定电机和减速机向上提升2吨重物
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