批处理文件不能正确读取行

testread.bat

@echo off
setlocal enabledelayedexpansion
set Counter=1
for /f %%i in (test.txt) do (
  set "Line_!Counter!=%%i"
  set /a Counter+=1
)

set /a NumLines=Counter - 1
echo %Line_1%
echo %Line_2%
echo %Line_3%
echo %Line_4%
echo %Line_5%
echo %Line_6%
pause
@echo off
setlocal enabledelayed