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. 
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://137b.nhde20.cn |

http://664f.nhde20.cn |

http://9.nhde20.cn |

http://1bf82.nhde20.cn/4dc9.html |

http://1bf82.nhde20.cn/705.html |

http://1bf82.nhde20.cn/06.html |

 第一次的感觉详细的