单项选择题
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
单项选择题 Maintaining the proper fuel oil temperature will result in （）
单项选择题 Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）
单项选择题 Which of the following statements is correct concerning diesel engine cooling water systems?（）
