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				1．Which of the following does a paper burn in?   A．CO2          B．N2            C．O2             D．H2			【查看更多】
			


		
           
          


		
          
		
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          Which of the following does paper burn in?
            
          A．CO2              B．N2                C．O2                 D．H2O
          

			
          
				查看答案和解析>>
			
          
		
          
				
          
									
          

          Which of the following does paper burn in?
          

          

          [　　]
          

          A．CO2
          

          

          B．N2
          

          

          C．He
          

          

          D．O2
          

          

          

			
          
				查看答案和解析>>
			
          
		
          
				
          
									
          

          Which of the following does paper burn in?
          

          [　　]
          

          

          A．CO2
          B．N2
          

          C．O2
          D．He
          

          

          

			
          
				查看答案和解析>>
			
          
		
          
				
          
									
          

          Which of the following does paper burn in?
          

          [　　]
          

          

          A．CO2
          B．N2
          

          C．O2
          D．H2
          

          

          

			
          
				查看答案和解析>>
			
          
		
          
						
          
				
          
	
          
	
          
		
          


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