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Building Materials - Section 7 :: Discussion
| 35. | 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. | |
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