谢谢，为什么用长螺钉（无头）？从上面还是下面敲进去？

来源: 大百百于 2017-09-29 15:21:32 [旧帖] [给我悄悄话] 本文已被阅读：次

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谢谢， 为什么用长螺钉（无头）？ 从上面还是下面敲进去？