试过KMS，没有成功，最后找到了对应的序列号就可以直接联网jihuo，序列号支持无限jihuo，只能用于评估版。
Available Content
Windows Server Long-Term Servicing Channel Preview is available in ISO format in 18 languages, and in VHDX format in English only. The following keys allow for unlimited activations:
Server Standard: MFY9F-XBN2F-TYFMP-CCV49-RMYVH
Datacenter: 2KNJJ-33Y9H-2GXGX-KMQWH-G6H67
Windows Server Semi-Annual Preview is available in ISO format in 18 Server languages, and in VHDX format in English only. The Semi-Annual Channel consists of the Core version for a smaller footprint. The following keys allow for unlimited activations:
Server Standard: V6N4W-86M3X-J77X3-JF6XW-D9PRV
Server Datacenter: B69WH-PRNHK-BXVK3-P9XF7-XD84W
Keys: Keys are valid for preview builds only. After activation for the preview keys is disabled, you may still install and use preview builds for development and testing purposes without activating.
