If the detergent type lubricating oil being used in a diesel engine is black, the oil （）
- Amust be centrifuged
- Bmust by filtered
- Cmust be changed
- Dis holding finely dispersed carbon in suspensio
问题
If the detergent type lubricating oil
参考解析：
分类：船舶电气与船舶安全题库
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