virtualbox for mac安装虚拟机win7

参考文档： https://blog.csdn.net/qq_31607947/article/details/79612830html https://blog.csdn.net/tterminator/article/details/49493777网络 密钥win7永久版密匙：spa 　　HT6VR-XMPDJ-2VBFV-R9PFY-3VP7R操作系统 1：安装VirtualBox-5.2

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