题目

A good relationship between students and teachers makes the classroom a very inviting place. When you consider your teachers as friends, it's easier to pay attention to their explanations and improve your grades. When your teachers consider you as a friend, they'll feel more open in class. __36__ Now there are some tips to develop friendly relationship with your teachers.  __37__ If you have any questions, ask them. That will make them notice you. But never ask questions you already know the answers to. If your teachers realize you are not asking real questions, they might think you ar电瓶车所用电池一般为铅蓄电池,这是一种典型的可充电电池,电池总反应式为Pb+PbO2+4H++2SO 2PbSO4+2H2O,则下列说法正确的是(  )A. 放电时:电子流动方向由A经导线流向BB. 放电时:正极反应是Pb-2e-+SO===PbSO4C. 充电时:铅蓄电池的负极应与充电器的正极相连D. 充电时:阳极反应是PbSO4-2e-+2H2O===PbO2+SO+4H+
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