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單項(xiàng)選擇題

Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）

A.residual carbon deposits
B.lube oil viscosity breakdown
C.uneven heat expansion of the rings
D.uneven heat expansion of the piston

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）

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

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