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拱背起拱线点
meaning in English
extrados springing
soffit spring
Related Words
横向拱
缺口拱
拱石
拱
向上拱
回廊拱
弧拱
板拱
塌落拱
端拱
拱背角
拱背梁
拱背升腿式
拱背线
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