A.5s B.6s C.8s D.10s
A.主機所有指示燈全滅 B.主機會不斷復(fù)位 C.電源板不能通電 D.信號機所有燈位全亮
A.250V;0.5A B.250V;0.75A C.250V;1A D.250V;2A