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				| 1. | What is the grain size of abrasive particles, which are often used for Abrasive water jet machining? | 
| A. | 0.01 – 0.50 µm | 
| B. | 10 – 150 µm | 
| C. | 200 – 500 µm | 
| D. | 500 – 1000 µm | 
| Answer» C. 200 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 500 ¬¨¬®¬¨¬µm | |