共 4 条
[1]
Business R&D performed in the United States reached$356 billion in 2015. Raymond M Wolfe. https://www.nsf.gov/statistics/2017/nsf17320/ . 2017
[2]
From Silicon Valley to the American heartland. Share America. https://share.america.gov/zh-hans/silicon-valley-american-heartland/ . 2017
[3]
Academics against immigration executiveorder. White House Press Office. https://notoimmigrationban.com/press-release.html . 2017
[4]
US R&D increased by$20 billion in2015,to$495 billion;estimates for 2016 indicate a rise to$510 billion. Mark Boroush. https://www.nsf.gov/statistics/2018/nsf18306/ . 2017