Answer
mm
Work Step by Step
The thread size of a pipe is a very small distance and requires a small unit of measurement. The best choice is $mm$, since $cm$ would be too large.
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: 27
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