... 外弧凿 outside gouge 齿尖螺旋线 outside helix 外毂 outside hub ...
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The once-through steam generator with double-side heat transfer component was presented in this paper. And the component is composed of straight tube outside and helix tube inside.
介绍了一种双面换热的套管式直流蒸汽发生器，其元件由直管外管和螺旋内管组成。
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