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				| 1. | What is the life of Tungsten carbide material nozzle?$ | 
| A. | 1 – 8 hrs | 
| B. | 2 – 5 hrs | 
| C. | 10 – 15 hrs | 
| D. | 25 – 40 hrs | 
| Answer» D. 25 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 40 hrs | |