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Building Materials - Section 3 :: Discussion
| 21. | Pick up the correct statement from the following: | |
| A. | Corrugated sheet iron is made by passing plain sheets between grooved rollers | |
| B. | Strength and stiffness of corrugated sheets are considerably increased | |
| C. | Corrugated sheets are generally gal-venised to protect iron from corrosion by rust | |
| D. | Corrugated sheets are generally used on slanting roofs | |
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