A.30,P2 B.20,P2 C.30,P1 D.20,P1
A.40kPa B.90kPa C.140kPa D.210kPa
A.DC100V(+10V,-30V) B.AC100V(+10V,-30V) C.DC220V(+10V,-30V) D.DC400V(+10V,-30V)