A.BT33F B.3CG23C C.IN4007 D.3AX23A
A.2接電源負(fù)極,1接電源正極 B.2接電源正極,1接電源負(fù)極 C.3接電源正極,4接電源負(fù)極 D.4接電源正極,3接電源負(fù)極
A.R1 B.R2 C.R3 D.R4