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1.Design and Construction of large Diameter Drilling Hollow Pile without Pile Caps
无承台大直径钻孔空心桩的设计与施工收藏指正
2.Hollow metal O-ring is inhibited to pile up with other products, to avoid bruising, scoring and compression damage.
1金属空心O形圈不允许与其它产品混合堆放，以防碰伤、划伤和压伤。收藏指正
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