探究新制饱和氯水成分的实验中,以下根据实验现象得出的结论错误的是( )A. 将氯水滴加在蘸有红墨水的布条上,过一会儿红色布条会褪色,说明
华盛顿被誉为“18世纪离去的最后一位伟人”,人们在他的遗嘱中发现一条规定,要求在他的妻子去世以后解放他家中的奴隶。他当总统时不能解放全国
下列反应不能用离子方程式:CO32- + 2H+ =CO2 ↑ + H2O表示的是 A.Na2CO3 + 2HCl = 2NaCl + CO2 ↑+ H2O B.K2CO3 + 2HNO3 = 2KNO3 + CO2 ↑ + H2O C.K2CO3 + H2SO4 = K2SO4
阅读理解阅读下列短文,然后从A、B、C、D四个选项中选出能回答所提问题或完成所给句子的最佳选项。Harry Potter and the Deathly Hallows By J. K.
英国君主立宪制是哪三者融为一体的混合物( ) ①君主制 ②贵族制 ③民主制 ④共和制A.①②③ B.②③
You've just come home, after living abroad for a few years. Since you've been away, has this country changed for the better—or for the worse? If you've just arrived back in the UK after a fortnig
下图是N、M两国人口年龄金字塔结构图,关于两类国家人口合理容量的叙述正确的是( ) A.N类国家因环境人口容量潜力大而人口增长快 B.M类国家因人
One day, a young man was cleaning out his late grandfather’s belongings when he came across a bright red envelope. Written on the front were the words, To my grandson. Recognizing his grandfather's