单项选择题
When used in conjunction with a turbocharger, the main function of an after-cooler is to （）
A.increase the density of the cylinder air charge B.prevent turbocharger overheating C.liminate the need for a pre-cooler D.remove moisture from air compressed by the turbocharger
单项选择题 One of function of diesel engine lubricating oil is to （）
单项选择题 Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）
单项选择题 After-cooling of a turbocharged diesel engine will result in （）
