解决方法：
[PowerShell] 注意后面的index2,是wim中映像包的顺序，可以通过命令获取。
获取包的index
1、 dism.exe /get-wiminfo /wimfile:d:\sources\install.wim)
Index : 1
Name :Windows Server 2012 SERVERSTANDARDCORE
Description : Windows Server 2012 SERVERSTANDARDCORE
Size : 7,195,580,708 bytes
Index : 2
Name :Windows Server 2012 SERVERSTANDARD
Description : Windows Server 2012 SERVERSTANDARD
Size : 11,999,848,937 bytes
Index : 3
Name :Windows Server 2012 SERVERDATACENTERCORE
Description : Windows Server 2012 SERVERDATACENTERCORE
Size : 7,176,243,455 bytes
Index : 4
Name :Windows Server 2012 SERVERDATACENTER
Description : Windows Server 2012 SERVERDATACENTER
Size : 11,995,224,677 bytes
我的测试是standard版，所以
2、Install-WindowsFeature Server-Gui-Shell -Source wim:d:\sources\install.wim:2
3、mkdir c:\mountdir
4、把安装光盘放在光驱或mount到光驱，这里是D盘；
4、dism /mount-wim /wimfile:d:\sources\install.wim /index:2 /mountdir:c:\mountdir /readonly
5. install-windowsfeature server-gui-mgmt-infra -source c:\mountdir\windows\winsxs,d:\sources\sxs
6.dism.exe /Unmount-Wim /MountDir:c:\mountdir /discard
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