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| Q. |
What is the vibration frequency of the surface vibrator? (in cycles per min.) |
| A. | 1000 to 6000 |
| B. | 3000 to 6000 |
| C. | 2000 to 6000 |
| D. | 2500 to 6500 |
| Answer» B. 3000 to 6000 | |
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