1. Refer to the ductibility and light-weight which improved the construction more safe reliability.
   钢结构延性好，自重轻、大大提高了住宅的安全可靠性。
2. But geosytheic of ductibility is large, the rough edge effect to a non-cutting and drilling operations.
   但分解质料的延展性较大，感化到无毛边的裁切和打孔操纵。

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