发布时间:2025-01-31 13:16:44
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。
我想学习司仪谁知道去哪里学靠谱啊求有经验的回答有没有同行的呀
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