The long term operation in past years shows that such a novel system can serve for a year round use with higher …
运行结果表明，该设计具有热效率高、防冻可靠、实用性能好等优点，可满足我国广大北方地区全年用热水的要求。
The long term operation in past years shows that such a novel system can serve for a year round use with higher …
运行结果表明，该设计具有热效率高、防冻可靠、实用性能好等优点，可满足我国广大北方地区全年用热水的要求。
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