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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 [Wrong Answer] |
B. | 1.32 [Correct Answer] |
C. | 1.66 [Wrong Answer] |
D. | 1.82 [Wrong Answer] |