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| Q. |
A small quantity of …………. % of gypsum is added to prevent flash-setting of the cement. |
| A. | 1 to 2 |
| B. | 2 to 3 |
| C. | 9 to 10 |
| D. | 10 to 12 |
| Answer» B. 2 to 3 | |
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