It is about the ring screw thread smoke channel of the boiler shell type gas tube in the boiler field.

锅壳式烟管锅炉烟管内置水管的环形螺纹烟道，它涉及锅炉领域。

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It is about the ring screw thread smoke channel of the boiler shell type gas tube in the boiler field.

锅壳式烟管锅炉烟管内置水管的环形螺纹烟道，它涉及锅炉领域。

youdao