A.1對B.2對C.6對D.4對
A.電池正極接電源負極，電池負極接電源負極B.電池正極接電源負極，電池負極接電源正極C.電池正極接電源正極，電池負極接電源負極D.電池正極接電源正極，電池負極接電源正極
A.12VB.24VC.48VD.36V
