A.15°~20° B.20°~25° C.20°~30° D.30°~35°
A.0.693C2R1R2/(R1+R2) B.0.693(R1+R2)/C2R1R2 C.0.693R2C2 D.0.693R1C1
A.脈沖調(diào)制 B.脈沖列調(diào)制 C.六路雙脈沖 D.六路單脈沖