elbow-shaped external column 肘形外柱

external-convection column sensitive element 柱状外对流敏感元件

External Data column 外部数据列 ; 外部资料栏

external auxiliary column 外部辅助柱

external reflux of column 分馏柱外回流

external gallery-column 外廊柱

external veins of vertebral column 脊柱外静脉 ; 椎浅静脉

external-loop bubble column crystallizer 外环流气泡塔结晶法