题目

He said he was feeling highly ______（荣誉）as one of the guests invited to the press conference. 答案：honoured铅蓄电池的负极及负极反应物为Pb，正极反应物为PbO2，电解质溶液是稀H2SO4溶液，原电池反应的产物之一是难溶性的PbSO4。写出铅蓄电池中的电极反应式和总反应式。 负极：_______________________；正极：______________________； 总反应式：_________________________________________。