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| Q. |
The permissible hardness of water for low pressure boiler is |
| A. | 50 mg/litre |
| B. | 150 mg/litre |
| C. | 250 mg/litre |
| D. | 350 kg/litre |
| E. | 450 mg/litre |
| Answer» A. 50 mg/litre | |
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