题干

黄铜(铜锌合金)的外观与黄金极为相似、容易以假乱真。小红同学想测定黄铜中锌的含量。她称取20g黄铜样品放入烧杯中,加入足量稀硫酸充分反应后,测得生成氢气的质量为0.2g。
上一题 下一题 0.0难度 选择题 更新时间:2014-06-20 07:13:51

答案(点此获取答案解析)

同类题3

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的作文。文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下画一横线,并在该词下面写出修改后的词。

注意:1)每处错误及其修改均仅限一词;

2)只允许修改10处,多者(从第11处起)不计分。

    A robot used for housework was going to be tested out in a family. He looked like a tall and handsome man with smooth black hair, speak in a deep voice. Larry was going to be away from home, so he hired such a robot to accompany with his wife Claire. Claire didn't like the idea at the beginning, and she agreed to it at last. At her first sight of Tony, Claire was alarming. When Tony offered to help her dress, Claire felt embarrassed. Gradual Tony began to win Claire's trust. He helped Claire realize her dreams by making her home elegant, giving her a new haircut, changing the makeup she wears and giving her advice on her dresses. Therefore at the party all the guest who were invited were filled with admiration when they saw her house was completely transformed. At same time, Tony left a deep impression on all of them. After the test, the company was satisfied with Tony's report because she had successfully made a woman regain her confident, although he shouldn't have her fall in love with him.