A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px; TEXT-DECORATION: none">直流发电机作为励磁电源的直流励磁机励磁系统</span>
B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px; TEXT-DECORATION: none">用硅整流装置将交流转化成直流后供给励磁的整流器励磁系统</span>
C、<span style="LINE-HEIGHT: 200%; FONT-FAMILY: 宋体; FONT-SIZE: 16px; TEXT-DECORATION: none">静止整流器励磁系统</span>
D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px; TEXT-DECORATION: none">旋转整流器励磁系统</span>