19. 鉛蓄電池之正負極分別為何種材料?(A)正極板:過氧化鉛 (PbO2),負極板:鉛 (Pb)(B)正極板:鉛 (Pb),負極板:過氧化鉛 (PbO2)(C)正極板:鉛 (Pb),負極板:碳酸鈣 (CaCO3)(D)正極板:過氧化鉛 (PbO2),負極板:硫酸鈣(CaSO4)