习近平总书记是在哪个省哪个县哪个村视察时首次正式提出“精准扶贫”的施政理念？
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Which command will configure a directory /commonfiles so that a user cannot delete files owned by other users in the same group（）？
A. chmod +S /commonfiles
B. chmod 4775 /commonfiles
C. chmod 1777 /commonfiles
D. chmod -orgx /commonfile
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