Automobile Engineering in ME
The condition that results in large quantities of CO emission is

Low temperature combustion
Insufficient air during combustion
High temperature combustion
Insufficient fuel during combustion

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

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

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