section{
    margin-bottom: 141px;
}
.banner_xiao{
    width:100%;
    height:auto;
}
.banner_xiao>img{
    width:100%;
    margin-top: -47px;
}
/*about_xian*/
.about_xian{
    width:100%;
    height:38px;
    margin-top: -4px;
    border-bottom: 1px solid #D2D2D2;
}
.about_xian_zi{
    width:1200px;
    margin:0 auto;
}
.about_xian_zi>p{
    color:#949494;
    font-size:12px;
    padding-top:11px;
}
/*检测项目*/
.P_nav{
    width:700px;
    margin:0 auto;
}
.P_nav>li{
    width:130px;
    padding:10px 10px;
    border:1px solid #949494;
    text-align: center;
    float:left;
    margin:50px 0 0 17px;
    color:#303030;
    cursor: pointer;
}
.project_dabox{

}
.project_box{
    width:1200px;
    margin:0 auto;
    overflow: hidden;
    /*padding-top:50px;*/
}
.project_box_left{
    float:left;
    width:576px;
    overflow: hidden;
    margin-top:50px;
}
.project_box_box_left{
    width:293px;
    height:243px;
    float:left;
}
.project_box_box_left>a>img{
    width:100%;
    height:100%;
}
.project_box_box_right{
    width:267px;
    float:right;
    margin-top:50px;
}
.pr_h4{
    cursor: pointer;
    color:#303030;
    font-size:20px;
    font-weight: bold;
}
.pr_xian{
    width:30px;
    height:1px;
    background:#A0A0A0;
    margin:20px 0px;
}
.pr_p{
    color:#656565;
    font-size:14px;
    line-height:24px;
}
.pr_h4:hover{
    color:#00ac91;
}
#kq,#sz,#tr,#hj{
    position: relative; /** 相对布局 **/
}
#kq:active,#sz:active,#tr:active,.hj:active{
    top: 2px; /**向下偏移2px **/
}