Table 1.
The Factors and Levels of the Central Composite Design Test
| Factors | Levels | ||
|---|---|---|---|
| −1 | 0 | 1 | |
| Hydration temperature X1 (°C) | 35 | 45 | 55 |
| Ultrasonic power X2 (W) | 60 | 100 | 140 |
| The counts of ultrasound X3 (Times) | 10 | 20 | 30 |
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