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

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单项选择题

A.air intake
B.a fuel outlet
C.cooling water inlets
D.exhausting combustion gas

单项选择题

A.poor cooling of cylinder walls
B.improper cooling of the piston
C.insufficient piston lubrication
D.all of the above

单项选择题

A.natural aspiration
B.masked intake valves
C.air cells
D.scavenging air