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console 命令行工具 X clear 

                    

                        
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console

            
<section class="row">
  <div style="background-color:pink"  class="col-sm-3 col-md-3 col-xs-offset-3">左边
  <section class="row">
    <div class="col-xs-6">1</div>
       <div class="col-xs-6">2</div>
         </section>
      </div>
   <div style="background-color:yellow;" class="col-md-6 col-sm-9">中间
  </div>
  <div style="background-color:yellowgreen;" class="col-md-3 col-sm-12">右边
  </div>
  </section>

            

                
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