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        1, Molybdenum acid, chemical molybdenum oxide, molybdenum copper filings, molybdenum ore powder.
        

        
2, Tungstic acid, chemical tungsten oxide, tungsten copper shavings, ammonium paratungstate.
        
		
        
		
        

		

        







        
       
        
	            
			  
        
			         	 
				     
        
					          
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