When two oil separators are working in series, they should work with （）<br>A:both as clarifiers<br>B:first one as clarifiers, second one as purifier<br>C:both as purifiers<br>D:first one as purifier, second one as clarifier

When two oil separators are working in series, they should work with （）
A:both as clarifiers
B:first one as clarifiers, second one as purifier
C:both as purifiers
D:first one as purifier, second one as clarifier

出自：海船船员证

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