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Which of the following is considered a Lewis acid?
Cylinders
Three-dimensional geometric shapes with straight parallel sides and a circular or oval cross-section.
Drill Bits
Tools made of hard material, often high-speed steel or carbide, used to create cylindrical holes.
Chamfering
The process of creating a beveled edge at the intersection of two surfaces to remove sharp edges for safety, aesthetics, or part assembly.
Groove
A long, narrow cut or depression in a hard material, often used to fit another component or allow the passage of fluids.
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