Question

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what is roughness average?
measurement used to examine the smoothness of a surface
micro feet
measurement used to measure thickness variation
none of the above

Explanation:

Roughness average is a parameter to assess surface smoothness. It quantifies the irregularities on a surface. Micro - feet is a unit of length, not related to the concept of roughness average. Measuring thickness variation is a different parameter from roughness average.

Answer:

Measurement used to examine the smoothness of a surface