When the regulation is performed by variable flow rate, there exist two operation regulation modes with fixed zero pressure difference and variable zero pressure difference.
采用变流量调节时，存在定零压差点和变零压差点两种运行调节方式。
When the regulation is performed by variable flow rate, there exist two operation regulation modes with fixed zero pressure difference and variable zero pressure difference.
采用变流量调节时，存在定零压差点和变零压差点两种运行调节方式。
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