what do you know about unit
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We can measure how big things are, how warm they are, how heavy they are, and many other features. For example, the metre is a standard unit to measure length. Before 1982, one meter was defined as the distance between two markers on a special metal rod.
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We can measure how big things are, how warm they are, how heavy they are, and many other features. For example, the metre is a standard unit to measure length. Before 1982, one meter was defined as the distance between two markers on a special metal rod. ... In the past, different units were used in different countries.
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