1. 3 4 4 5 6 7 Ng SOYINKI 2. MD MDF 10Hz 50Hz 60Hz 1 1 3 1N 4 3. NR 2 2 aa IEC79 3 d C IIA IB I 1 TT2 3 4 TT1 T2 3 XY 10C 40C 10C 40C 90 90 Os 10C d0 4. C 90 90 10C 120C 70 10C 150C 70C 100 100 X 1 X IN 2 1N 1 N 2 N 3 5. Showa Ex Ex IN 1 ee 9 Ss 3 3 enet 4 SC 4 5 i 4 6 ee 4 9 JIS 1