Answer
Millimeters.
Work Step by Step
Millimeters would make the most sense because of the small size of the thickness of the sheet metal.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 3 - Section 3.2 - Length - Exercise - Page 141: 20
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