A.發(fā)電機(jī)B.蓄電池C.發(fā)電機(jī)和蓄電池D.大電容
A.1對(duì)B.2對(duì)C.6對(duì)D.4對(duì)
A.電池正極接電源負(fù)極,電池負(fù)極接電源負(fù)極B.電池正極接電源負(fù)極,電池負(fù)極接電源正極C.電池正極接電源正極,電池負(fù)極接電源負(fù)極D.電池正極接電源正極,電池負(fù)極接電源正極