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1. |
What must be the velocity of the carrier gas that carries the abrasive particles? |
A. | 10 – 50 m/sec |
B. | 50 – 150 m/sec |
C. | 150 –300 m/sec |
D. | 300 – 500 m/sec |
Answer» D. 300 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 500 m/sec | |