The most economical central angle of an arch dam is made at ___________________?
Correct answer: B. 133!
- A. 123º
- B. 133!
- C. 143º
- D. 153º
Explanation
The economical central angle for an arch dam is conventionally taken as about 133°, which balances arch length and structural efficiency. The exclamation mark in option b is evidently a typographical error for the degree notation.
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