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Building Materials - Section 3 :: Discussion
| 33. | Pick up the correct statement from the following: | |
| A. | Plastics have generally low melting point | |
| B. | The coefficient of thermal expansion of plastics is about three times than that of steel | |
| C. | The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67 | |
| D. | All the above. | |
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