搜索 - 科创

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引用 power_rcx:缺点是这样一来，私钥很容易丢失。丢失私钥之后无法再签发新的证书，除非要求所有客户端都更新公钥。可以在一个安全的不联网的地方存储备份，需要恢复的时候依然可以恢复

话说六轴有六轴的用处，六轴不但可以做更复杂的零件，还能在3D加工时大大提高加工效率，本人做过7年加工了，三轴电脑锣操作，编程过MASTERCAM。铣床，车床，线割加工都行。只是对控制方面有待学习

引用张志衡:我和你的经历相同，4年级时认为能量守恒定论可以被打破，认为能造出永动机，一直研究了2年，最后以失败告终。【简单物理学】永动机真的存在吗？bilibili_哔哩哔哩 http://www...

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