A:电池放电时Li+向负极移动
B:电池放电时,正极的电极反应式为:2Li++Li2O2+2e﹣═2Li2O
C:电池充电时,Li极应与外电源的正极相连
D:电池系统内进入二氧化碳及水对电池性能不会产生影响
选出不同类的单词
①____A. sun B. moon C. swing D. star
②____ A. blue B. bright C. yellow D. red
③____A. bag B. small C..big D. bright
④____A. evening B. morning C. moon D. afternoon
⑤____ A. table B. bowl C. desk D. chair
请回答下列问题:
—The stuntman is planning to walk on the wings of a flying plane.
—What?! I've never heard of idea before.
如图,已知菱形ABCD的对角线AC、BD的长分别为6cm、8cm,AE⊥BC于点E,则AE的长是____ .