Addition of copper to aluminium results in________?
Aimprovement of corrosion resistance
Bimprovement of casting characteristics
Cone of the best known age and precipitation-hardening systems
Dimproving machinability
Enone of the above
Correct answer
C. one of the best known age and precipitation-hardening systems
Explanation
The correct answer is one of the best known age and precipitation-hardening systems.