单选题Trunk type diesel engine pistons are effectively cooled when heat is（）Aradiated through the engine blockBtransferred to water cooled cylinder wallsCconducted through the piston crownDtransferred to escaping exhaust gases
单选题
Trunk type diesel engine pistons are effectively cooled when heat is（）
A
radiated through the engine block
B
transferred to water cooled cylinder walls
C
conducted through the piston crown
D
transferred to escaping exhaust gases
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