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				| 1. | What is the percentage of contribution of cavitation to the total material removed? | 
| A. | <5% | 
| B. | 5 – 10 % | 
| C. | 10 – 20 % | 
| D. | 20 – 50 % | 
| Answer» B. 5 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 10 % | |