@media screen and (max-width: 750px) {
/*公用导航，页底 样式设置*/
    body{
      min-width: auto;
    }

    /* 宽度100% */
      .wrap,
      .nav_left,
      .nav_left img,
      .nav_main .base,
      .base,
      body,
      .main,
      .main_left,
      .main_right   
      {
        width: 100%;
      }

    /* 高度自适应 */
      .nav_main .base,
      .nav_bg,
      .nav_left .xq,
      .nav_left img
      {
        height: auto;
      }

    /* 隐藏 */
      .sy_top,
      .nav_right,
      .xq_tab,
      .index_nav_r,
      .class170109,
      .base_fixed,
      .bottom_part2,
      .bottom_part3,
      .right_fixed,
      .base_fixed_sy2,
      .right-fixed-btn
      {
        display: none;
      }
      .nav_bg{
        padding: 8px;
      }
      .nav_left a{
        width: 40%;
      }
      .nav_left .xq{
        float: right;
      }
      .nav_left a
      {
        float: left;
      }
      .nav_left img{
        float: none;
      }
      .nav_fixed{
        border-bottom: 1px solid #ddd;
      }



}