久久金品,一区二区三区久久,欧美色综合久久,国产精品每日在线观看男人的天堂,91精品国产永久在线观看,中文字幕网av,国产精品99久久免费观看

This kind of product is comprised of high-damping rubber and plate connected with bolts.It is used under 8 degrees of seismic intensity in highways and municipal bridges.Products comply with:JT/T 842-2012 High damping seismic isolation rubber bearings for highway bridges and GB 20688.2-2006 Elastomeric seismic-protection isolators for bridges.