A.一相觸電 B.兩相觸電 C.跨步電壓觸電 D.高壓觸電
A.49.3~49.5 B.49.1~49.2 C.48.9~49.0 D.49.2~49.3
A.1.2 B.1.15 C.1.1 D.1.25