1.

The phase angle of the system G(s) =s+5/s2+4s+9;varies between

A. 0° and 90°
B. 0° and -90°
C. 0° and -180°
D. -90° and -180°
Answer» C. 0¬¨¬®‚Äö√†√ª and -180¬¨¬®‚Äö√†√ª


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