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://5g.nhde20.cn |

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http://ios.nhde20.cn |

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http://90fc.nhde20.cn |

http://dedcde.nhde20.cn |

http://3g.nhde20.cn/0d.html |

http://3g.nhde20.cn/e7.html |

http://3g.nhde20.cn/0ebb2a.html |

 二龙一洞前后夹击