When inspecting piston rings through the ports of a two-stroke/cycle diesel engine black
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When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of .
A.insufficient lubrication
B.improper piston cooling
C.blow-by
D.overload operation
请帮忙给出正确答案和分析,谢谢!
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