Cast iron contains ____________________ percent carbon?
Correct answer: A. 2.5
- A. 2.5
- B. 3.75
- C. 4.75
- D. 5.25
Explanation
Cast iron generally contains about 2.1 to 4.3% carbon, whereas steel contains less than roughly 2.1%. Among the choices, 2.5% falls within the normal cast-iron range.
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