单项选择题
A.discharge exhaust gases and smoke
B.furnish energy to the turbocharger
C.reduce engine room noise
D.all of the above
单项选择题 Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）
单项选择题 A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is （）
单项选择题 In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）