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1. |
How much is the value of surface finished, achieved using Ultrasonic Polishing? |
A. | 0.1 μm |
B. | 0.3 μm |
C. | 0.5 μm |
D. | 0.7 μm |
Answer» C. 0.5 ‚âà√≠¬¨‚à´m | |