单选题Trunk-type diesel engine pistons are most effectively cooled by heat（）Aconducted through the engine blockBconducted to water cooled cylinder wallsCconducted through the piston crownDloss to escaping exhaust gases
单选题
Trunk-type diesel engine pistons are most effectively cooled by heat（）
A
conducted through the engine block
B
conducted to water cooled cylinder walls
C
conducted through the piston crown
D
loss to escaping exhaust gases
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