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Engineering, 30.11.2020 18:00 Bidboidipper

35 points and brainiest. A, B, C, D Which of the following identifies what carbide-tipped bits, lines on machine bolts, and lock washers all have in common?

A. All are very expensive items.
B. All are very recent inventions.
C. All are rather outdated inventions.
D. All provide an added level of strength.

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