单选题If the detergent type lubricating oil being used in a diesel engine is black, the oil （）Amust be centrifugedBmust by filteredCmust be changedDis holding finely dispersed carbon in suspension
单选题
If the detergent type lubricating oil being used in a diesel engine is black, the oil （）
A
must be centrifuged
B
must by filtered
C
must be changed
D
is holding finely dispersed carbon in suspension
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