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        4. 方管
          5. 
       
      
        5. 無縫方管
          6. 
       
      
        6. Q235方管
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        7. Q345B方管
          8. 
       
      
        8. 大口徑方管
          9. 
       
      
        9. 厚壁方管
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        10. Q345B矩形管
          11. 
       
      
        11. 低合金矩形管
          12. 
       
          

          

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          大口徑方管
        
          
        
          
          
        
          
        
          
          
          
              
          
                大口徑方管
              
          
              
          
            
          		
        
          
      
          		
  
          


          

          
  
          
    
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