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1. |
The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is |
A. | 1.02 |
B. | 1.32 |
C. | 1.66 |
D. | 1.82 |
Answer» C. 1.66 | |