The following measures can be used to improve oily water separator’s separating effect except （）<br>A:overhauling every two year<br>B:working at intervals<br>C:renewing filtration material<br>D:pumping bilge water from different layers respectively

The following measures can be used to improve oily water separator’s separating effect except （）
A:overhauling every two year
B:working at intervals
C:renewing filtration material
D:pumping bilge water from different layers respectively

出自：海船船员证

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