把抛物线$y=\frac{1}{2}{x}^2-1$先向右平移1个单位，再向下平移2个单位，得到的抛物线的解析式为

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    I am seven. I go to school every day. Classes start at eight o'clock. In the morning. I have Chinese, Art and Maths. I have English and P.E. in the afternoon. I get home at half past four. I watch TV at home. I have a good friend, Xiaotian. He sleeps at school. He goes to bed at nine. I go to bed at half past nine.

你一定看过电视剧《西游记》吧！那么你知道剧中的唐僧是依据历史上哪个人物原型创作的（     ）

甲、乙、丙三位同学分别用如下三套实验装置及化学药品（其中碱石灰为固体氢氧化钠和生石灰的混合物）制取氨气．请你参与探究，并回答下列问题：