六级士官 发表于 2013-11-15 18:39:17

复杂的机械 简单的原理

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好方案 发表于 2013-11-15 18:39:54

哈哈，看了好多遍的视频。

biggunner 发表于 2013-11-15 18:40:46

都很不错

信客 发表于 2013-11-15 18:41:37

发过了

青春0328 发表于 2013-11-15 18:42:07

谢谢分享

ws456456 发表于 2013-11-15 18:42:37

要是在中学生时代看到这些东西，那人生肯定会不一样了。
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sc526332192 发表于 2013-11-15 18:43:31

要是每个都懂了，也就牛掰了。

yuanzhi83 发表于 2013-11-15 18:44:24

见过

ntkd 发表于 2013-11-15 18:45:10

永恒的经典

Dandylian 发表于 2013-11-15 18:45:49

不错，学习了！
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