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| economic effect (1) |
| Energy audit (1) |
| energy efficiency (1) |
| internal rate of return (1) |
| net present value (1) |
| ore-dressing and processing enterprise (1) |
| return on investment (1) |
| economic effect (1) |
| Energy audit (1) |
| energy efficiency (1) |
| internal rate of return (1) |
| net present value (1) |
| ore-dressing and processing enterprise (1) |
| return on investment (1) |