window.parent.document.getElementById('hy_con').style.display='';window.parent.document.getElementById('hy_con').innerHTML='<DIV align=center><IMG alt="各国铁路环境噪声限值dB(A) " src="/upfile/2010929/2010929952235507.jpg" align=textTop border=0></DIV><H3 align=center>各国铁路环境噪声限值dB(A) </H3>';