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| Q. |
Best ballast contains stones varying in size from |
| A. | 1.5 cm to 3 cm |
| B. | 2.0 cm to 4 cm |
| C. | 2.0 cm to 5 cm |
| D. | 2.5 cm to 6 cm |
| Answer» C. 2.0 cm to 5 cm | |
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