The precision of the ultrasonic flowmeter with small tube diameter and frequency difference method is affected by several factors, so to gain more accuracy is difficult.
小管径频差法超声波流量计的测量精度受各种因素的影响，因而获得较高精度比较困难。
The precision of the ultrasonic flowmeter with small tube diameter and frequency difference method is affected by several factors, so to gain more accuracy is difficult.
小管径频差法超声波流量计的测量精度受各种因素的影响，因而获得较高精度比较困难。
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