2.                     
                            
                
                    
                
                    
        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.
                            
               
           
           
                        
           
          3. 
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http://www.nhde20.cn/f61.html |

http://www.nhde20.cn/e48.html |

http://www.nhde20.cn/c100.html |

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