STATA preserve restore交替配合使用
preserve keep in 1/1048575 save d:\te\安徽1,replace restore preserve keep in 1048576/2000000 save d:\te\安徽2,replace restore keep in 2000000/2583957 save d:\te\安徽3,replace
preserve keep in 1/1048575 save d:\te\安徽1,replace restore preserve keep in 1048576/2000000 save d:\te\安徽2,replace restore keep in 2000000/2583957 save d:\te\安徽3,replace