变频调速技术应用于建筑热水供应系统时，该热水系统为闭式。
When the technique of regulating speed with frequency conversion is applied to the hot water system in construction the system should be sealed.
变频调速技术应用于建筑热水供应系统时，该热水系统为闭式。
When the technique of regulating speed with frequency conversion is applied to the hot water system in construction the system should be sealed.
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