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[软件] 渐开线蜗杆与圆柱齿轮啮合 设计与制造系统 WSG2.1版 |
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点评
公益的东西当然是大家都喜欢的,但是要做到专业级别的,很多东西没有Money是很难支撑的,毕竟我们都是要生存的,估计到共产主义社会了,我们就可以不用考虑RMB的问题了!
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