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				| 1. | What are the values of buffing speeds used in ECB process? | 
| A. | 0.1 – 0.6 m/s | 
| B. | 1 – 6 m/s | 
| C. | 10 – 16 m/s | 
| D. | 100 – 600 m/s | 
| Answer» C. 10 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 16 m/s | |