Theessentialpartofthedieselengine,whosefunctionistoconverttheheatenergyintothemechanicalpower,isthe（）. A: crankshaft B: piston C: connectingrod D: bearing
Theessentialpartofthedieselengine,whosefunctionistoconverttheheatenergyintothemechanicalpower,isthe（）. A: crankshaft B: piston C: connectingrod D: bearing
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