3.                     
                            
                
                    
                
                    
        OCW makes the materials used in the teaching of MIT's subjects available on the Web.
         
         
         
        Learn more about how to use OpenCourseWare. Click to get started.
                            
               
           
           
                        
           
          2. 
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http://45793.nhde20.cn/1a.html |

http://45793.nhde20.cn/12.html |

 俺来啦俺去了官网