.buwei_tongzhi,.shengting_tongzhi{width:500px;float:left;height:auto;margin-left:60px;}  

/*.shengting_tongzhi{width:500px;float:left;height:auto;margin-left:60px;}*/

.buwei_div{height:200px;}


/* 科学普及 */
.kexue_img img{width:350px;height:150px;margin-top:88px;}
.kexue_img li{width:500px;height:262px;text-align: center;}