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              Lesson 5 The structures and properties of paint film
               工業(yè)科技 
              
				
              

										 
                      5.5.1 The structure of filmThe purpose of dry process is to improve the value and durability of synthetic leather. Theapplication and using condition of different synthetic leather is different,so the requirements totop coating are not the same. The gener......（本文共 14708 字）      [閱讀本文] >> 
               
			  
				 
              
				 
				
				
              
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