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non metal are usually poor conductor of heat and electricity non metals are generally poor conductor of heat and electricity true or false non metals are generally poor conductors of heat and electricity except non metals are generally poor conductors of heat and electricity non metals are usually poor conductors of heat and electricity they are non lustrous non metal are poor conductor of heat and electricity non metals are poor conductor of heat and electricity true or false non metal are bad conductor of heat and electricity example which non metal is a poor conductor of electricity
