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 includes:Elastomeric seismic-protection isolators for bridges and buildings.It can absorb earthquake energy effectively by way of rubber’s elasticity and lead’s restorability.Products comply with:JT/T 822-2001 Lead rubber bearing isolator for highway bridge and GB 20688.3-2006 Elastomeric seismic-protection isolators for buildings.