... 有效直径,节径(螺纹) effective diameter 有效差压 effective differential pressure 有效数位 effective digit ...
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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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