发布时间:2025-01-24 00:51:27
承插哈夫节用于管道的直管部位发生砂眼、裂缝、断裂的抢修; 承插哈夫节用于管道的承插部位松动、破裂的抢修.本产品是我司结合用户的意见,作了
如果是跨度7米的大梁立柱用8跟22的钢筋是否可以梁又该怎么用钢筋
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