发布时间:2025-01-19 02:35:39
1/6-1/4内。为保证梁底方木安装方便,弧形梁模板弧长控制在1.2m1.5m左右为宜。,三铰拱或弧形轻型桁架,至于拱高,可在1/6-1/4内取值,南方防风,北方防雪。
都说中国的筷子一头圆一头方 天圆地方 那为什么吃的时候手拿筷子是天在下面地在上面
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