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				| 1. | The triple- threaded screw is made to rotate 10 revolutions for this the screw advances to 90 mm. What is the pitch of screw? | 
| A. | 4.5 mm | 
| B. | 9 mm | 
| C. | 1 mm | 
| D. | 3 mm | 
| Answer» E. | |