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我在用电解饱和食盐水的方法制取氯气时,饱和食盐水溶液变成绿色,电极是铜和铅笔芯,为什么阳极没有生成氯气,而阴极却生成了氢气, 黄金和醋会发生什么反应 市场营销三种一般性竞争战略 已知电解饱和食盐水可制得Cl2,又已知铅蓄电池放电时发生如下反应：正极：PbO2+4H++SO4^2-+2e-=PbSO4+2H2已知电解饱和食盐水可制得Cl2,又已知铅蓄电池放电时发生如下反应：正极：PbO2+4H++SO4^2-+2e-=P 这块矿石是什么成份?外表是黑色的,但用锤子打开后,里面是银色的金属光泽,不能被磁铁吸引,密度应该很大. 什么是多元化竞争战略 铁钉、锌片、铝片分别在酒精灯上加热什么现象?这几个金属会变成什么颜色? 用酒精灯给胆矾晶体加热有什么现象?用酒精灯给胆矾晶体加热:蓝色晶体变为 ;试管口有 生成. China,Japan的形容词 用酒精灯加热土会发生什么现象?这种现象说明土壤里含有什么物质? 过氧化氢用酒精灯加热后什么现象?说明什么? he informed the editor that his arrest had been while carrying out his instructions.这句话对吗?为什么? he had at last been allowed to send a fax in which he informed the editor that he had been arrested while counting the 1084 steps leading to the palace.that he had arrested这里是什么从句,先行词是谁. He had at last been allowed to send a fax in which he informed the editor that.此句中的at last为什么放在been前面? he had at last been allowed to send a fax in which he informed the editor that he hadbeen arrestedhe had at last been allowed to send a fax in which he informed the editor that he had been arrested 这里的which是指fax是吗 为什么fax前要加I However, he had at last been allowed to send a fax in which he informed the editor that the he had been arrested while counting the 1,084 steps leading to the fifteen-foot wall which surrounded the president's palace中which前为什么加in? 一个铅蓄电池的电压是多少 面料：67.4%聚酯纤维+13.4%腈纶+12.5%羊毛+5.2%粘胶纤维+1.5%锦纶的衣服洗后会起 我这件衣服能不能水洗?面料:羊毛60%聚酯纤维40% 罗纹:棉75%粘胶20%锦纶5% 其他的都是聚酯纤维. 铁在氧气中燃烧生成的氧化物主要成分是什么? 英语翻译谢谢个位朋友,我现在急需知道这句话的意思,帮我翻译下. 英语翻译This is the last time That I will say these words I remember the first time The first of many lies Sweep it into the corner Or hide it under the bed Say these things they go away But they never do Something I wasn‘t sure of But I was in The Last Time --- taylor swift 求歌词翻译. I took for granted,all the times That I thought would last somehow如何翻译 英语翻译The Last TimeRihannaonce was a time you and imade a promise till the day we dieI trusted each and every wordnever thinkin that I'd get burnedsilly me I believed in your fairy talesboy i thought that i knew you so very wellbut you walked o 在我国家庭垃圾可分为哪几种 he had at last been allowed to send a fax in which he informed the editor 请问which前为什么加inhe had at last been allowed to send a fax in which he informed the editor that he had been arrested while counting the 1084 steps leading to the pal However, he had at last been allowed to send a fax in which.However, he had at last been allowed to send a fax in which he informed the editor that the he had been arrested while counting the 1,084 steps leading to the fifteen-foot wall which surroun NO. You don't feel sad. Because the life is yours. at last. I hope you happyHave lifted a call, have lifted weights for that weight. Better to be not weight lifting 这两句话分别是什么意思啊 ______ last week,she lived a quiet and happy life in the countryside.a.Not until the earth -moving machines cameb.The earth- moving machinges camec.Until the earth-moving machines camed.Then came the earth-moving machines _____ last week, she lived a. quiet and happy life in that area. A. Not until the earth-moving machines came B. The earth-moving machines came C. Until the earth-moving machines came D. Then came the earth-moving machines这句话能翻译分析 Last Saturday,when I cleaned up my house,I found a box simply markd "Nick".这篇文章原文,ar Once,there were several researchers in the forest,trying to study the rarest creature in the world.这篇文章原文,