99精品噜噜噜成人av_国产小视频在线观看网站_久久久久亚州AⅤ无码专区首_videos18娇小粉嫩极品高清_亚洲日韩小电影在线观看_狠狠色婷婷丁香综合久久韩国电影_成人免费va视频_曰本真人性做爰高清视频_国产精品久久久久久久久上海公司 _中国丰满熟妇xxxx性

[ Products Description ] 
Embossed ceramic ball is a new product developed on the basis of inert ceramics ball by forming lot of knobs uniformly on the sphere of the ball. It can increase the surface area and free volume, and decrease the bulk density and the resistance of the system. As a new efficient support and covering material of catalyst, it can be widely used in oil refinery, chemical, fertilizer, natural gas and environmental protection industries.