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				| 1. | What should be the approximate thickness of a wall for better performance if the corrosion rate of that wall is estimated as 1/8 inches in 1 year? | 
| A. | 1/2 inches | 
| B. | 1/8 inches | 
| C. | 1/4 inches | 
| D. | 1/16 inches | 
| Answer» D. 1/16 inches | |