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				| 1. | For what purpose, FET s are included in phase sensitive detectors? | 
| A. | As SPDT switches, for working with very high frequency signals | 
| B. | As SPDT switches, for working with very low frequency signals | 
| C. | As SPST switches, for working with very high frequency signals | 
| D. | As SPST switches, for working with very low frequency signals | 
| Answer» C. As SPST switches, for working with very high frequency signals | |