A.正向額定總壓降20V,每級4V B.正向額定總壓降20V,每級5V C.正向額定總壓降35V,每級5V D.正向額定總壓降35V,每級7V
A.1.00% B.1.50% C.3.50% D.4%
A.5 B.6 C.7 D.8