发布时间:2025-01-18 21:16:43
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。
沁园净水器频繁冲洗跳动制水不到一秒又跳回冲洗怎么回事型号185一a
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