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什么叫? 用氯化锌溶液电镀铁为什么阴极是Zn离子得电子而不是氢离子 在原电池的半电池中,例如Zn做负极,氯化锌做电解质,但是锌不与氯化锌反应,请问锌为什么会自动失电子Zn失电子被氧化是由于和电解质发生反应,但现在锌不与氯化锌反应,他怎么失电子了,有 220V的电器可以用230V电源充电么 原电池中的电耗完对化学反应意味着什么?是电极消耗完了、电解液消耗完了还是盐桥里没有离子了?盐桥里没有了KCL或者说溶液的浓度和电解液相同时,还能原电池中还有电流吗? 触碰反应一段时间后取出盐桥的原电池的电解液, 使用盐桥的原电池中既然要求电极不与电解液反应,那么为什么电子还会转移?比如负极是Zn，电解液是ZnSO4，它们不是不会发生氧化还原反应吗？ 求《Dying in the sun》这首歌歌词的含义想表达的是什么样的情感呢 dying in the sun这首歌是谁唱的,dying in the dying. in the sun是什么意思啊 dying in the 酒店房间如何做无烟处理 木头为什么能烧 l spent 25 dollars on this pair of sports shoes last week.对25 dollars进行提问[ ] [ ] [ ] you [ ] on this pair of sports shoes last week? He studies English in Tianjin.(用five months ago 改写） People live in tall ____ (bright) buildings.最好今天晚上9点前要有,o(>_ People live in tall buildings and they can be close to their friends and ______quickly The students want to------- We use the elevator to go up and down the tall buildings.为什么student加s,而elevator不加s. I was in No.1primary School last year改为一般疑问句 1.（）martyrs have heroically laid down their live for the peopleA.Thousand upon thousand of B.Thousand and thousands ofC.Thousands upon thousands ofD.Thousand and thousand of 2.They received （）of letters about their TV programs A.dizen B.dozen 有机颜料和无机颜料有什么区别 把I bought this pair of shoes in the supermarket改为被动句 急求爱情与人生的论文,字数2000字左右 Tommy bought a pair of new gloves last week .but he can't find __today A them B it C this Dthat Kids always like watching the m() jumping up and down in the zoo people saw something____(usually)____(run)down from his nose,blood! All the chinese people jumped up and down cheering为什么要用cheering The girl feels like buying a new pair of shoes同义句 The girl___ ___ ___ buy a new pair of shoes this pair of shoes is w________.you should buy a new pair. a pair of new shoes 还是a new pair of shoes The Yellow River is the second 【long】river in China适当形式填空 on New Year's Day还是in New Year's Day