单项选择题

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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单项选择题

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

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