One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is （）<br>A:seal water supply be cut off<br>B:make-up water supply be cut off<br>C:oil outlet valve closed or not open sufficiently<br>D:the flow rate of oil is too much

One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is （）
A:seal water supply be cut off
B:make-up water supply be cut off
C:oil outlet valve closed or not open sufficiently
D:the flow rate of oil is too much

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