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console 命令行工具 X clear 

                    

                        
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console

            
<?xml version="1.0"?>
<svg width="300" height="300" viewPort="0 0 200 300" version="1.1" xmlns="http://www.w3.org/2000/svg">
      <circle  cx="50" cy="50" r="25" fill="none" stroke-width="4" stroke="#b1b1b1" stroke-dasharray="10 15" stroke-dashoffset="0"/>
      <circle  cx="150" cy="50" r="25" fill="none" stroke-width="4" stroke="#b1b1b1" stroke-dasharray="10 15" stroke-dashoffset="10"/>
      <circle  cx="250" cy="50" r="25" fill="none" stroke-width="4" stroke="#b1b1b1" stroke-dasharray="10 15" stroke-dashoffset="20"/>
  
      <circle  cx="50" cy="150" r="25" fill="none" stroke-width="4" stroke="#b1b1b1" stroke-dasharray="20 15" stroke-dashoffset="30"/>
      <circle  cx="150" cy="150" r="25" fill="none" stroke-width="4" stroke="#b1b1b1" stroke-dasharray="20 15" stroke-dashoffset="40"/>
      <circle  cx="250" cy="150" r="25" fill="none" stroke-width="4" stroke="#b1b1b1" stroke-dasharray="20 15" stroke-dashoffset="50"/>
  
  </svg>