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这样试试呢

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in ('dir /b /ad A*') do (
     for /f "delims=" %%b in ('dir /b "%%a"') do (
          set filename=%%b
          copy "%%a\%%b" "B!filename:~,2!\"
    )
)
pause
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