.introduce_1{
	background: url("../images/36.png")  no-repeat center top ;
	height: 400px;
	margin: 0 auto;
	background-size:cover;  
}


.introduce_2{
	background: url("../images/80.jpg")  no-repeat center top ;
	height: 800px;
	width:1200px;
	margin: 0 auto;
}


.introduce_3{
	background: url("../images/81.jpg")  no-repeat center top ;
	height: 800px;
	width:1200px;
	margin: 0 auto;
}


.introduce_4{
	background: url("../images/82.jpg") no-repeat center top ;
	height: 800px;
	width:1200px;
	margin: 0 auto;
}

.introduce_5{
	background: url("../images/83.jpg")  no-repeat center top ;
	height: 800px;
	width:1200px;
	margin: 0 auto;
}


.introduce_6{
	background: url("../images/41.png") no-repeat center top ;
	height:872px;
	width:1000px;
	margin: 0 auto;
}

.introduce_7{
	background: url("../images/84.jpg")  no-repeat center top ;
	height: 800px;
	width:1200px;
	margin: 0 auto;
}