Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.<br>A:throughput<br>B:back pressure<br>C:gravity disc<br>D:None of the above is wrong

Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.
A:throughput
B:back pressure
C:gravity disc
D:None of the above is wrong

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