Factor and level of orthogonal experiment.
| Factors | Level | ||
|---|---|---|---|
| 1 | 2 | 3 | |
| A, Diatomite size | 100 | 300 | 500 |
| B, Temperature (°C) | 25 | 30 | 35 |
| C, Relative humidity (%) | 55 | 65 | 75 |
| D, Diatomite dosage (g m−2) | 10 | 20 | 30 |
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