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| Q. |
Pick up the correct statement from the following: |
| A. | Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer |
| B. | Cupola furnace is used for the manufacture of cast iron |
| C. | Red short iron is of no value for welding purpose |
| D. | All the above |
| Answer» D. All the above | |
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