亚洲小视频-亚洲小视频网站-亚洲小视频在线-亚洲小视频在线播放-三级全黄裸体-三级日本黄色片

This kind of product includes a slender steel core continuously supported by a concrete casing in order to prevent buckling under axial compression.The core and the casing are decoupled by bond-preventing layer.It can resist lateral force and has superior ductile and energy dessiative behavior.Products comply with:JG/T 209-2012 Dampers for vibration energy dissipation of buildings.