发布时间:2025-01-21 04:48:20
释义:L表示“梁”,(450~500)表示梁高450~500变化,160表示翼缘宽度,6表示腹板厚度,8表示翼缘厚度。
最近室内顶棚有点滴水,可室外刚做了防水不久,有谁能帮我找一下原因和给一下解决方法
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