单选题In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.Athe outlet of oilBthe outlet of waterCthe bowl peripheryDthe center of bowl
单选题
In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.
A
the outlet of oil
B
the outlet of water
C
the bowl periphery
D
the center of bowl
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