钢卷尺的原理钢卷尺的伸、曲原理?其切面为凹形怎样从力学角度分析?那不知大家玩过一个小玩样儿没,也是一铁皮做的,曾经上学玩过,大概20cm长,横切面也是凹的,平时是直的,把它一
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![钢卷尺的原理钢卷尺的伸、曲原理?其切面为凹形怎样从力学角度分析?那不知大家玩过一个小玩样儿没,也是一铁皮做的,曾经上学玩过,大概20cm长,横切面也是凹的,平时是直的,把它一](/uploads/image/z/7057036-28-6.jpg?t=%E9%92%A2%E5%8D%B7%E5%B0%BA%E7%9A%84%E5%8E%9F%E7%90%86%E9%92%A2%E5%8D%B7%E5%B0%BA%E7%9A%84%E4%BC%B8%E3%80%81%E6%9B%B2%E5%8E%9F%E7%90%86%3F%E5%85%B6%E5%88%87%E9%9D%A2%E4%B8%BA%E5%87%B9%E5%BD%A2%E6%80%8E%E6%A0%B7%E4%BB%8E%E5%8A%9B%E5%AD%A6%E8%A7%92%E5%BA%A6%E5%88%86%E6%9E%90%3F%E9%82%A3%E4%B8%8D%E7%9F%A5%E5%A4%A7%E5%AE%B6%E7%8E%A9%E8%BF%87%E4%B8%80%E4%B8%AA%E5%B0%8F%E7%8E%A9%E6%A0%B7%E5%84%BF%E6%B2%A1%EF%BC%8C%E4%B9%9F%E6%98%AF%E4%B8%80%E9%93%81%E7%9A%AE%E5%81%9A%E7%9A%84%EF%BC%8C%E6%9B%BE%E7%BB%8F%E4%B8%8A%E5%AD%A6%E7%8E%A9%E8%BF%87%EF%BC%8C%E5%A4%A7%E6%A6%8220cm%E9%95%BF%EF%BC%8C%E6%A8%AA%E5%88%87%E9%9D%A2%E4%B9%9F%E6%98%AF%E5%87%B9%E7%9A%84%EF%BC%8C%E5%B9%B3%E6%97%B6%E6%98%AF%E7%9B%B4%E7%9A%84%EF%BC%8C%E6%8A%8A%E5%AE%83%E4%B8%80)
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