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				| 1. | Between which values does the frontal gap s surface roughness vary? | 
| A. | 0.02 to 0.13 m | 
| B. | 0.30 to 1.90 m | 
| C. | 1.93 to 2.64 m | 
| D. | 2.73 to 4.26 m | 
| Answer» C. 1.93 to 2.64 m | |