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        polypropylene
        
	        	
               Data：2020-05-07 11:44:17
        
	        	
        
 	        		
         polypropylene/PP, usded as the raw material of disposable surgical mask
        
 
 
	        	
        
	         
	        
        
		    
        
		
        

 
 
        
 
        
  
        
    
    
    

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