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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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