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Single-factor experimental design.
| Single factor | Power (W) | Concentration (%) | Temperature (℃) | Time (h) |
|---|---|---|---|---|
| Power | 40, 80, 120, 180 | 120 | 120 | 120 |
| Concentration | 70 | 50, 60, 70, 80, 90 | 70 | 70 |
| Temperature | 70 | 70 | 40, 50, 60, 70, 80 | 70 |
| Time | 1 | 1 | 1 | 0.5, 1, 1.5, 2, 3 |
