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| frequency difference before and after film coating (Hz) | frequency response value (Hz) | the response time (s) | recovery time (s) |
|---|---|---|---|
| 2397.0 | 0.9 | 31 | 35 |
| 5593.0 | 2.5 | 60 | 65 |
| 7191.0 | 3.0 | 120 | 130 |
