A.1:1200,0:1800 B.1:1500,0:1800 C.1:1800,0:1200 D.1:1200,0:1500
A.±1V B.±2V C.±0.5V D.±1.5V
A.10Ω;20Ω B.5Ω;15Ω C.5Ω;10Ω D.10Ω;30Ω