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並前往https://superuser.com/questions/689847/how-to-set-use-an-empty-string-value-in-a-variable-in-windows-xp-cmd-exe-command

How to set/use an empty string value in a variable in Windows ...

tl;dr - Problem you got there is that echo %Q% expands to echo . Use echo.%Q%. Expanded Answer. echo command got 4 behaviors:.

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