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          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://532.nhde20.cn |

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http://b901b0.nhde20.cn/c17.html |

http://b901b0.nhde20.cn/6b.html |

 嗯不要用这个嗯我错了