1.

The ratio of the transfer function Io/Is is$

A. s(s + 4)/(s<sup>2</sup> + 3s + 4)
B. s(s + 4)/(s + 1)(s + 3)
C. (s<sup>2</sup> + 3s + 4)/s(s + 4)
D. (s + 1)(s + 3)/s(s + 4)
Answer» B. s(s + 4)/(s + 1)(s + 3)


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