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				| 1. | The double- threaded screw is made to rotate 2 revolutions for this the screw advances to 40 mm. What is the pitch of helix? | 
| A. | 40 mm | 
| B. | 10 mm | 
| C. | 20 mm | 
| D. | 22 mm | 
| Answer» D. 22 mm | |