本实用新型的半圆弧形板的内空腔构成蒸气管路，节省材料和安装体积，成本较低。
An inner hollow cavity of the semicircle arc plate of the utility model is comprising of a steam tube, with advantages of saving material and installment column, and low cost.
本实用新型的半圆弧形板的内空腔构成蒸气管路，节省材料和安装体积，成本较低。
An inner hollow cavity of the semicircle arc plate of the utility model is comprising of a steam tube, with advantages of saving material and installment column, and low cost.
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