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2022 - 02 - 04 - t21:25:42.503 + 05:30
对商业分析和工程原理理解的评论:开圈螺旋弹簧和闭圈螺旋弹簧的区别
Harikesh Divedi -机械工程师
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标签:blogger.com, 1999:博客- 2712639998409783165. - post - 1912606064190837530
2019 - 09 - 19 t23:03:34.548 + 05:30
2019 - 09 - 19 t23:03:34.548 + 05:30
刚度公式为
刚度公式为
匿名
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