单选题In an auxiliary diesel engine, the reason for knurling the piston skirt is to（）Aimprove skirt lubricationBallow for expansionCtransmit forces evenlyDimprove the piston seal
单选题
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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