3.                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
        6. 
http://www.248.26 |

http://m.248.26 |

http://wap.248.26 |

http://3g.248.26 |

http://4g.248.26 |

http://5g.248.26 |

http://mobile.248.26 |

http://vip.248.26 |

http://ios.248.26 |

http://anzhuo.248.26 |

http://b84.248.26 |

http://0afa62.248.26 |

http://e798.248.26 |

http://04497.248.26 |

http://7.248.26 |

http://1.248.26 |

交换性原则正确的是