.about_size {
	font-size: 0;
	margin: 0px auto;
	padding: 0;
	list-style-type: none;
	display: block;
	width: 100%;
	/*background-color:#fff;*/
	position: relative;
	margin-bottom:0px;
	overflow:hidden;
		clear:both;
			/*border-radius: 5px 5px 0 0;*/
				border: 0px solid blue;	

}
.about_size div.about_dummy {
	padding-top: 70%;/*改变图片的高度*/
}
.about_size img{
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	width:100%;/*固定图片大小*/

	/*max-width: 100%;
	max-height: 100%;*/
	display: block;
	margin: auto;
	padding: auto;
	border: 0px solid blue;	
	/*border-radius: 0px;*/
}



.about_size2 {
	font-size: 0;
	margin: 0px auto;
	padding: 0;
	list-style-type: none;
	display: block;
	width: 100%;
	/*background-color:#fff;*/
	position: relative;
	margin-bottom:0px;
	overflow:hidden;
		clear:both;
			/*border-radius: 5px 5px 0 0;*/
				border: 0px solid blue;	

}
.about_size2 div.about_dummy2 {
	padding-top: 120%;/*改变图片的高度*/
}
.about_size2 img{
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	width:100%;/*固定图片大小*/

	/*max-width: 100%;
	max-height: 100%;*/
	display: block;
	margin: auto;
	padding: auto;
	border: 0px solid blue;	
	/*border-radius: 0px;*/
}