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目前,配备有变压降式节流装置的流量计的用量约占全部流量仪表的70—80％。而以节流装置作为流量检测元件时的基本方程中的流出系数c满足如下方程:
At present, the flowmeter equipped with variable-pressure drop-type throttling device accounts for about 70-80% of all flow meters. While the flow-out coefficient c in the basic equation when the throttle device is used as the flow rate detecting element satisfies the following equation: