国产成人99久久亚洲综合精品_麻豆合集_毛片.com_亚洲一区二区天海翼 ,成年视频人免费网站_国模国产精品嫩模大尺度视频_午夜黄片视频高清在线观

Tempered glass/Reinforced glass is a safety glass. Tempered glass is actually a kind of prestressed glass. In order to increase the strength of the glass, chemical or physical methods are usually used to form compressive stress on the surface of the glass. When the glass is subjected to external force, the surface stress is first offset, thereby improving the bearing capacity and enhancing the resistance of the glass itself. Wind pressure, cold and heat, impact and so on.