A.G1(S)+G2(S) B.G1(S)-G2(S) C.G1(S)G2(S) D.G1(S)/G2(S)
A.G1(S)+G2(S) B.TI-G2(S) C.G1(S)G2(S) D.G1(S)/G2(S)
A.比例B.積分C.微分D.慣性