install.packages("package",repos = "https://mran.microsoft.com/snapshot/2019-02-01/")
解决install.packages(“dplyr“,pepos=‘https://mran.microsoft.com/snapshot/2019-02-01/‘)Installing pa】
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2022-03-10
install.packages("package",repos = "https://mran.microsoft.com/snapshot/2019-02-01/")
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