If consciousness is an accident of evolution, and the universe holds no inherent meaning—why do humans cling so desperately to the illu ...展开全文c 24132 273 ñ46670 1月28日 10:56 来自微博网页版 已编辑 û收藏 转发 评论 ñ赞 c +关注 DFM大肥猫 1月25...
VSP plastic Inner Arc packing : VSP ring also named Mella ring,VSP ring means very special packing in foreign country meaning very excellent packing. It has many advantages such as low pressure drop, large throughout, high efficiency, high operating elasticity, perfect ...