what is the use of exams
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To show our talent exam is uesd it not just to learn and write but the preparation and practice of future education
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Liquid nitrogen—LN₂—is nitrogen in a liquid state at low temperature. Liquid nitrogen has a boiling point of about −195.8 °C. It is produced industrially by fractional distillation of liquid air. It is a colorless, low viscosity liquid that is widely used as a coolant.
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