可以辦理單方麵豁免,需要美國政府agency (IGA) 比如NIH,NSF,NASA等的推薦信。
http://www.state.gov/
可以辦理單方麵豁免,需要美國政府agency (IGA) 比如NIH,NSF,NASA等的推薦信。
http://www.state.gov/
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