/*去除默认样式 开始*/
body,
h1,
h2,
h3,
h4,
h5,
h6,
ul,
li,
dl,
dt,
dd,
ol,
p,
input,
select,
option,
textarea,
button {
  margin: 0;
  padding: 0;
  font-family: 'Microsoft YaHei';
  font-weight: normal;
}
ul,
li,
ol,
dl,
dt,
dd {
  list-style: none;
}
input,
button,
select,
textarea {
  border: none;
  background: none;
  outline: none;
}
textarea {
  resize: none;
}
img {
  border: none;
  vertical-align: middle;
  outline: none;
}
a {
  display: inline-block;  
  text-decoration: none;
  outline: none;
}
a:hover {
  text-decoration: none;
}
em,
i,
u {
  font-style: normal;
}
b,
strong {
  font-weight: normal;
}
.clearfix,
body {
  background: #fff;
  font-size: 14px;
}
.fl {
  float: left;
}
.fr {
  float: right;
}
.column {
  width: 1170px;
  margin: 20px auto 0;
  overflow: hidden;
  margin-bottom: 30px;
  font-family: "Microsoft YaHei";
}
.col-l {
  width: 850px;
  float: left;
}
.col-r {
  width: 299px;
  float: right;
  border-left: 1px solid #eee;
  padding-left: 20px;
}
.clearfix:after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}

@media(min-width: 993px){
.nav_main>img:nth-of-type(1){
    display:inline-block;
}
.nav_main>img:nth-of-type(2){
    display:none;
}}
@media(max-width: 992px){
  .nav_main>img:nth-of-type(1){
    display: none;
  }
  .nav_main>img:nth-of-type(2){
    width: 322px;
    margin-top: -26px;
    margin-left: -47px;
  }
}

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