A.±5V B.±10V C.±15V D.±20V
A.-6.70V對應(yīng)8號:-7.76V B.-4V’對應(yīng)8號:-8.65V C.-2V對應(yīng)8號:-9V D.-1V、0V對應(yīng)8號:-9.5V
A.2.5V B.1000V C.2.5kV D.1000kV