发布时间:2025-01-19 02:28:30
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。
某工厂为支援抗震救灾赶制一批帐篷第一天生产了这批帐篷总数的20第二天生产了总数的二十分之七
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