A.1% B.2% C.5% D.10%
A.1 B.2 C.3 D.4
A.1~3年 B.小修后 C.大修后 D.新作终端或接头后
A.0.5MΩ B.1MΩ C.2MΩ D.2.5MΩ
A.50A B.100A C.150A D.200A