.nav .product a{border-bottom:solid 2px #076ce0;color:#076ce0;}
.big .banner{width:100%;height:450px;background:url(../images/116.jpg)no-repeat center center;}
.big .banner2{width:100%;height:150px;background:url(../images/116.jpg)no-repeat center top;}
.part{width:1200px;height:415px;margin:0 auto;padding-top:40px;}
.part img{width:500px;height:334px;float:left;}
.part-1 .tws,.part-2 .trs,.part-3 .tas,.part-4 .tes{width:680px;height:455px;float:right;}
.part-1{margin-top:20px;}
.part h2{font:26px/52px "微软雅黑";}
.part span{width:628px;display: block;margin:20px 0;}
.part span,.part li{font:14px/26px "微软雅黑";}