发布时间:2025-01-31 13:12:15
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。
我想要在不锈钢的门框上打眼然后固定几个螺丝钉要用什么钻头和螺丝钉
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