题目

某同学利用下图装置研究可燃物燃烧的条件。已知：白磷的着火点是40℃，棉花的着火点是210℃，大烧杯里分别装有15℃的冷水和80℃的热水。实验操作如下表： 步骤操作现象 ①将U型管放入冷水中，打开K1 ， 关闭K2无现象 ②打开K2 ， 关闭K1？ ③将U型管放入热水中同步骤②现象 ④？裹入白磷的棉花燃烧 ⑤打开K2 ， 关闭K1裹入白磷的棉花熄灭 （1） 步骤②的现象是：。 （2） 步骤④的操作是： 。 （3） 比较分析步骤阅读下面短文，根据短文中的信息完成文后表格 (每空一词)。What is your favourite cartoon？It may be difficult for you to decide. But for pianist Lang Lang, Tom and Jerry is the best one.When Lang was two years old, he saw Tom playing the piano. This was his first time to enjoy western music and this experience encouraged him to learn to play the piano.His talent (天资) at the keyboard has taken him from Shenyang to the world.Lang became a good piano student at three. Ever since, the boy has been doing better and better. In 1997,the 15?year?old boy studied at a famous American music college.Lang's performances are energetic (充满活力的)．He is well known for making facial expressions and moving around while playing the piano.The road to success has never been easy. Lang's father stopped his job to look after him, while his mother stayed in Shenyang to make money. But Lang considers himself lucky and believes he should give something back. He has helped the children in poor areas a lot.Personal 1.CardAbout his personal lifeNameLang LangYear of birth2.3.KeyboardFavourite 4.Tom and JerryThe reason for 5. poor childrenHe believes himself lucky and should give something back.About his musical lifeThe 6.for western music in his childhood encouraged him to learn the piano7..With the help of his parents and teachers, he was able to 8.a famous American music college, where his success began.Famous for his9. performances and10.facial expressions and moving around while playing the piano.