单项选择题
Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?（）
A.Planetary gear set B.Torsional vibration damper C.Friction clutch D.Air bladder clutch
单项选择题 When used in conjunction with a turbocharger, the main function of an after-cooler is to （）
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?（）
