发布时间:2025-02-06 12:16:03
楼上的基本正确了.
单个吊环受的是纯拉力,负载能力是看螺纹的大小.两个时受的是拉力和剪应力.而最重要的是剪应力.因为受力区只是螺杆的横截面,比起受拉力的螺纹截面小多了.
新房装修,电路一直正常,今天管控家里所有插座的空气开关突然跳闸,而且直接顶了楼道里总闸,没找出原因,求教
2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:032024年家庭ktv音响十大品牌排行榜点歌机家庭影院哪个牌子好家庭ktv音响什么牌子好
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2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03家里装修水路图左边的是太阳能下水阀门中间的是太阳能上水阀门右边的是冷水阀门也就是说太阳能上
2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03 2025-02-06 12:16:03