Alarge,low-speed,mainpropulsiondieselengineusesseawatertodirectlycoolthe（）. A: cylinderheads B: exhaustvalves C: scavengingair D: injectors
Alarge,low-speed,mainpropulsiondieselengineusesseawatertodirectlycoolthe（）. A: cylinderheads B: exhaustvalves C: scavengingair D: injectors
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