Question

........standard unit of length​

Answer 1

Explanation:

standard unit of measure for length in the U.S. is miles, and in the rest of the world, it is kilometers. On a smaller scale, such as measuring the length of a pen, we use inches in the U.S. and centimeters in the rest of the world. Other U.S. measurements that we use for length are feet and yards.

Answer 2

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Standard Unit of Length is Metre or Centimetre.