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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 | |