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                                    單項選擇題
                                    
    測量不確定度的值是（）。
    
                                
    
                                
                                    
    
	A.正值或負值
    
	B.恒為正值
    
	C.恒為負值
    
	D.0
    

    
                                
                                
                                
    
                                    
                                    
                                
    
                                

                        
    
                    
                
    

                
                    
                    

            
    
            
    
                
            
    
        
    
    
    
    

    

    
    
    
        
    
            
    
                
                
    

                
    
            
    
        
    
    
    

    

    
    
    
        
        
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