A.變長(zhǎng) B.縮短 C.不變 D.無關(guān)
A.全開 B.全關(guān) C.在全開和全關(guān)間快速振蕩 D.狀態(tài)不變
A.G1(s)+G2(s) B.G1(s)-G2(s) C.G1(s)×G2(s) D.1+G1(s)×G2(s)