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      3. 
    
    
      
    
      
        
        
      
        
        
        
        
      
            
        
      
    
      

      
    
    
      
        
        
      
            aa
            bb
            
      
                
      
                    
                
      
            
      
            
        
      
        
        
      
            
      
                
      
                    
      
                        
      行業(yè)
      
                        
      
                            
      機(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)械五金
      
                            
                        
      
                    
      
                    
      
                        
      材質(zhì)
      
                        
                    
      
                    
      
                        
      污染物
      
                        
                    
      
                
      
                
      
                    
                    
                    
                
      
                
      
    
      
        ?
        ?
        
        ?
        ?
    
      

      

      
    
      
        ?
        ?
        
        ?
        ?