Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）<br>A:starting the engine while hot<br>B:knurling the piston skirt<br>C:operating the engine overheated<br>D:scuff resistant piston rings

Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
A:starting the engine while hot
B:knurling the piston skirt
C:operating the engine overheated
D:scuff resistant piston rings

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