可以办理单方面豁免,需要美国政府agency (IGA) 比如NIH,NSF,NASA等的推荐信。
http://www.state.gov/
可以办理单方面豁免,需要美国政府agency (IGA) 比如NIH,NSF,NASA等的推荐信。
http://www.state.gov/
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