内热式沸腾干燥器是聚氯乙烯生产中关键核心设备，换热管组是该设备上主要部件。
Internal heated boiling dryer is the key equipment in the production of the polyvinyl chloride, and the heat transfer tubes are the key part in this equipment.
内热式沸腾干燥器是聚氯乙烯生产中关键核心设备，换热管组是该设备上主要部件。
Internal heated boiling dryer is the key equipment in the production of the polyvinyl chloride, and the heat transfer tubes are the key part in this equipment.
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