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.
                          
             
         
         
                      
         
          1. 
http://www.nhde20.cn |

http://m.nhde20.cn |

http://wap.nhde20.cn |

http://3g.nhde20.cn |

http://4g.nhde20.cn |

http://5g.nhde20.cn |

http://mobile.nhde20.cn |

http://vip.nhde20.cn |

http://ios.nhde20.cn |

http://anzhuo.nhde20.cn |

http://9893.nhde20.cn |

http://3dec8.nhde20.cn |

http://d452.nhde20.cn |

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

http://www.nhde20.cn/79.html |

http://www.nhde20.cn/f1.html |

 叉进去的过程视频