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    System input variables are generally referred to as ____, and outputs as controller outputs
    
    
    
	19. System input variables are generally referred to as ____, and outputs as controller outputs.
    
        - Reference Inputs
- Reference Outputs
- Controller Inputs
- None of the above
Answer: A) Reference Inputs
    Explanation:
    System input variables are generally referred to as reference inputs, and controller outputs as controller outputs.