发布时间:2025-01-21 12:13:24
三跑楼梯 每跑1267 三跑就3800了 楼梯井做60 可与增大楼梯净尺寸
踏步宽260 高158.3 长等于梯段宽1020 中间休息平台一个为1180,另一个为1200
1020+60+1020=2100
1180+260x7+1200=4200
1267x3=3800
雪纺面料和雪纺网纱的区别是什么 雪纺面料和雪纺网纱的区别是什么意思
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