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 （）
A.one-half engine speed B.the same as engine speed C.twice engine speed D.four times engine speed
单项选择题 In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）
单项选择题 Diesel engine piston seizure can be caused by （）
单项选择题 Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
