body{margin:0 auto; padding:0; width:100%; min-width:320px;  max-width:640px;}
img{width:100%;}
li{list-style-type:none;}
p{margin:0; padding:0; font-family:"微软雅黑";}
p{font-size:18px; line-height:32px;}
p{text-indent:2em;}
.p_top{margin-top:3%;}
@media screen and (max-width:320px){ p{font-size:9px; line-height:16px;}}
@media screen and (min-width:330px) and (max-width:480px){ p{font-size:11px; line-height:24px;}}
@media screen and (min-width:490px) and (max-width:640px){ p{font-size:18px; line-height:32px;}}
.introduce_1{width:100%; margin:0 auto 5% auto; overflow:hidden;}
.introduce_2{width:79.0625%; margin:0 auto; overflow:hidden;}
.introduce_3{width:47.6563%; margin:4% auto; overflow:hidden;}
.introduce_tu{width:78.75%; margin:0 auto; overflow:hidden;}
.introduce_tu_1{width:78.75%; margin:0 auto 5% auto; overflow:hidden;}
.introduce_tu_zi{width:78.75%; margin:2.2% auto 5.7% auto; overflow:hidden;}
.introduce_tu_zi p{text-indent:0;}
.introduce_4{width:79.5312%; margin:0 auto; overflow:hidden;}