发布时间:2025-01-31 11:50:52
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。
头条号的电脑登录入口在哪里问手机注册的今日头条账号怎么在电脑上登陆
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