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https://read.oecd-ilibrary.org/science-and-technology/main-science-and-technology-indicators-volume-2018-issue-1/technology-balance-of-payments-receipts_msti-v2018-1-table66-en
您即将离开知乎,请注意您的帐号和财产安全。
https://read.oecd-ilibrary.org/science-and-technology/main-science-and-technology-indicators-volume-2018-issue-1/technology-balance-of-payments-receipts_msti-v2018-1-table66-en