 
			 
			MCQOPTIONS
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				| 1. | Most total station instruments measure angles by means of ______ of extremely precise digital bar-codes etched on rotating glass cylinders or discs within the instrument. | 
| A. | Refraction | 
| B. | Electro-optical scanning | 
| C. | Radiation | 
| D. | None of the above | 
| Answer» C. Radiation | |