它是利用蒸汽或电为热源，用轴流风机与热交换器以对流的方式加热空气。
It USES steam or electric heater as heating resource and USES axial fan, heat exchanger to heat air in convective way.
它是利用蒸汽或电为热源，用轴流风机与热交换器以对流的方式加热空气。
It USES steam or electric heater as heating resource and USES axial fan, heat exchanger to heat air in convective way.
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