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The frequency difference is detected by a photo - electric detector and countered by a frequency meter.
频差由光电探测器检测,其大小由频率计读出.
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This paper designed a kind of ultrasonic gas meter applying LM 1812 according as the frequency - difference method.
介绍以频差法为依据,应用超声波专用集成电路LM1812设计的一种超声波气体流量计.
频差???
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