An effective and energy saving heating system needs many control devices, such as flow controllers and differential pressure controllers.
每一个有效节能的供热系统都配有相应的调节控制设备，如自力式流量控制阀、压差控制阀等。
An effective and energy saving heating system needs many control devices, such as flow controllers and differential pressure controllers.
每一个有效节能的供热系统都配有相应的调节控制设备，如自力式流量控制阀、压差控制阀等。
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