这千岛湖的水啊平均含沙量是每立方米0.007千克。
The sand content in the water of Qiandao Lake averages just 0.007 kilos per cubic meter.
笔者采用数字手段去测取超声波信号的频差，通过频差法可得出流体的平均速度，进而获得高含沙量流体的流量。
A digital signal processing way is established to obtain ultrasonic signal frequency shift in the test of high sand content fluid flow.
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