frequency difference gain
frequency difference gain
频差增益
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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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