R语言加载包不成功

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install.packages("Matrix")Installing package into ‘C:/Users/Sam/Documents/R/win-library/3.4’(as ‘lib’ is unspecified)trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/Matrix_1.2-12.zip'Warning in install.packages :  InternetOpenUrl failed: '无法与服务器建立连接'Error in download.file(url, destfile, method, mode = "wb", ...) :   cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/Matrix_1.2-12.zip'Warning in install.packages :  download of package ‘Matrix’ failed求解

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关键词：求助

1. install.packages("Matrix",repos = 'https://mirrors.tuna.tsinghua.edu.cn/CRAN/')

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