单项选择题
High exhaust back pressure will result in an increase in （）
A.turbocharger efficiency B.engine power output C.carbon deposits on fuel injectors D.cylinder scavenging
单项选择题 An increased differential between the inlet and outlet of a strainer usually indicates the strainer is （）
单项选择题 Trunk type diesel engine pistons are effectively cooled when heat is（）
单项选择题 Maintaining the proper fuel oil temperature will result in （）
