A:充电电池的化学反应原理是氧化还原反应
B:充电是使放电时的氧化还原反应逆向进行
C:充电电池可以无限制地反复放电、充电
D:较长时间不使用电器时,最好从电器中取出电池,并妥善存放
⑴Bob is a good football player. ____
⑵Last Saturday, my father and I watched a basketball game.____
⑶This is our team.____
⑷—Who won? ____
—Tom's team won.
⑸My brother is a policeman.____
A. B. C.
D. E.
圆x2+y2=1上的点到点M3,4的距离的最小值是( )