Electric Circuits
If all the elements in a particular network are linear, then the superposition theorem would hold, when the excitation is

 An Impulse
 DC only
 AC only
 Either AC or DC

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Electric Circuits
A pole of driving point impedance is

 zero current for a finite value of driving voltage.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving current.
 zero voltage for a finite value of driving current.

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