In an auxiliary diesel engine, the reason for knurling the piston skirt is to（）<br>A:improve skirt lubrication<br>B:allow for expansion<br>C:transmit forces evenly<br>D:improve the piston seal

In an auxiliary diesel engine, the reason for knurling the piston skirt is to（）
A:improve skirt lubrication
B:allow for expansion
C:transmit forces evenly
D:improve the piston seal

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