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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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单选题Trunk type diesel engine pistons are effectively cooled when heat is（）A
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单选题Cold weather starting of a diesel engine is more difficult than warm weather starting due to（）A
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