A.12 B.13 C.14 D.15
A.20 B.30 C.40 D.50
A.2.0kV/s正負(fù)0.2kV B.3.0kV/s正負(fù)0.2kV C.4.0kV/s正負(fù)0.2kV D.5.0kV/s正負(fù)0.2kV