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Q. |
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 |
Answer» D. All the above |
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