    
      
                     
 
                                     
                                      
                                
         
 
                             
                                   
                                    
                                                                            
                        
                         
                                                               
                                                                                        
  3              
                                                       ［2］                          
                                                                                                                                                                                                                
             
               
                 
             
               
                              
             
                
                  
             
                 
                   
             
                
                  
              
                
                   
               
                 
                  
              
                  
                       
                                                                                    
  ①          
 
               
                  
                      
               
                 
                      
                
                   
                    
               
                   
                    
               
                    
                     
                                            
  ②                                             

    