In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.<br>A:the outlet of oil<br>B:the outlet of water<br>C:the bowl periphery<br>D:the center of bowl

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

出自：海船船员证

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