However, distant river field also is facing the dilemma with degressive resource.然而, 辽河油田也面临着资源递减的困境.To the farmer, when they are sharing information resource, be in asymmetry, imparity, adverse position apparently.对于农民来...
These units are employed as grit arrester on small cupola.这种装置在小型冲天炉中是作为砂粒分离器使用的.The flame arrester can be installed horizontally or vertically.本阻火器可水平安装,也可垂直安装.It provides reliable basis for design of new type arrester....