General Science
Kilohertz is a unit which measures

Voltage
Electromagnetic radio wave frequencies
Power used by a current of one ampere
Electric resistance

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General Science
Among the various allotrope of carbon

Diamond is the hardest, graphite is the softest
Diamond is the hardest, lamp black is the softest
Diamond is the hardest, coke is the softest
Coke is the hardest, graphite is the softest

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