不挂科搜题免费

问题:



选项

  • {1,2,3,4,6,12};

  • {1,2,3,4,6,8,12,14};

  • {1,2,3,…,12};

  • {1,2,3,4}。

  • 答案:

    A.{1,2,3,4,6,12};