Clock pendulums are usually made of _______________ steel?
Correct answer: D. None of these
- A. High speed
- B. Stainless
- C. Heat resisting
- D. None of these
Explanation
Clock pendulums are normally made from Invar, a nickel-iron alloy with an exceptionally small coefficient of thermal expansion. Since Invar is not among the listed choices, “None of these” is correct.
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