发布时间:2025-01-31 13:14:50
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。
我家在农村离电信接线盒有点远200米左右电信说这么远不能装家用光纤我能不能自己买线延长这样
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