Automobile Engineering in ME
The characteristic that is enhanced by the honing of cylinder sleeves inner surface is

Cooling efficiency
None of these
Resistance to wear
Lubrication performance

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Balance the timing in the movement of the two groups of pistons
Reduce vibrations caused by the crankshaft rotation
Increase inertia force of the rotating crankshaft
Adjusts the timing of the intake and exhaust valve openings

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