本发明有如下的优点：准确反应瞬时流量和累计流量，读数准确，使用效果好。
The invention has the following advantages: accurate responses the instantaneous flow quantity and total flow quantity, accurate readings, well using affect.
本发明有如下的优点：准确反应瞬时流量和累计流量，读数准确，使用效果好。
The invention has the following advantages: accurate responses the instantaneous flow quantity and total flow quantity, accurate readings, well using affect.
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