When two oil separators are working in series, they should work with （）
- Aboth as clarifiers
- Bfirst one as clarifiers, second one as purifier
- Cboth as purifiers
- Dfirst one as purifier, second one as clarifier
问题
When two oil separators are working in
参考解析：
分类：船舶电气与船舶安全题库
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