题型:问答题 简答题 (9分)下表是元素周期表的一部分,回答下列问题: ⅠAⅡAⅢAⅣAⅤAⅥAⅦA02 ①②③④ 3⑤⑥⑦⑧⑨⑩(1)写出①、③两种元素形成的化合物有两种,化学式是: , 。(2)写出⑥元素最高价氧化物的电子式和②元素气态氢化物结构式 , 。(3)这些元素的最高价氧化物的对应水化物中___________(填化学式,下同)酸性最强;________碱性最强;能形成两性氢氧化物的元素是________。 查看答案
题型:问答题 简答题 自有中国历史以来,还没有过这样伟大而彻底的文化革命。( )A. There had never been so a great and thoroughgoing cultural revolution since the dawn of Chinese history.B. There had never been such a great and thoroughgoing cultural revolution from the dawn of Chinese history.C. There had never been so great and thoroughgoing cultural revolution since the dawn of Chinese history.D. There had never been such a great and thoroughgoing cultural revolution since the dawn of Chinese history. 查看答案