Materials and Components
The residual resistivity of a binary alloy at 0 K is

Sum of residual resistivities of component metals
Difference of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy
Product of residual resistivities of component metals

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Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

Low thermal conductivity and high melting point
High thermal conductivity and high melting point
Low thermal conductivity and low melting pointL
High thermal conductivity and low melting point

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