centrex Centralized Extension System 集中式用户专用交换机
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The combined heating with solar heat source and heat source of centralized heat-supply system is an effective method to fulfill the extension of heating period and supply of domestic hot water.
引入太阳能热源系统与集中供热热源联合供热是实现增加供热时间及供应生活热水的有效方法。
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