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                                    單項(xiàng)選擇題
                                    
    減速地點(diǎn)標(biāo)，設(shè)在需要減速地點(diǎn)的兩端各（）米.
    
                                
    
                                
                                    
    
	A.20
    
	B.50
    
	C.30
    
	D.100
    

    
                                
                                
                                
    
                                    
                                    
                                
    
                                

                        
    
                    
                
    

                
                    
                    

            
    
            
    
                
            
    
        
    
    
    
    

    

    
    
    
        
    
            
    
                
                
    

                
    
            
    
        
    
    
    

    

    
    
    
        
        
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