To ensure oil purifier working in normal condition,the interval between two sludge discharging should not exceed（） hours.<br>A:2<br>B:4<br>C:5<br>D:6

To ensure oil purifier working in normal condition,the interval between two sludge discharging should not exceed（） hours.
A:2
B:4
C:5
D:6

出自：海船船员证

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