.arth1 {
	margin:0 auto 30px;
    text-align: center;
    font-size: 28px;
}
.titleH2 {
    font-size: 24px;
    text-align: center;
    font-weight: bold;
    position: relative;
    color:red;
}
.collect img{
	max-width: 100%;
}
.collect span{
	font-size: 16px;
	font-weight: bold;
}
/*采样方法*/
@media (min-width: 1400px){
 
}
@media (min-width: 1000px) and (max-width:1400px){
 
}
@media (max-width:1000px){
	
}
@media (max-width:700px){
}