When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）<br>A:insufficient lubrication<br>B:improper piston cooling<br>C:blow-by<br>D:overload operation

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

出自：海船船员证

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