orificen.孔orifice support tube锐孔支管orifice column mixer筛板塔混合器orifice differential孔流分压计orifice viscosimeter管孔粘度计,孔口粘度计orifice of spinneret吐丝孔orifice control valve锐孔调节阀,孔板节流阀orifice plate opening孔板洞orifice of pulp canal齿根尖孔, 齿髓管口orifice-column mixer筛板塔混合器Orifice or Gas Cup Size喷孔或喷嘴尺寸