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. 
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http://3g.nhde20.cn |

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http://5g.nhde20.cn |

http://mobile.nhde20.cn |

http://vip.nhde20.cn |

http://ios.nhde20.cn |

http://anzhuo.nhde20.cn |

http://23b.nhde20.cn |

http://381e.nhde20.cn |

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http://e45793.nhde20.cn/d528.html |

http://e45793.nhde20.cn/4750.html |

http://e45793.nhde20.cn/b03.html |

 给几个网址大家懂得