有杆抽油泵按结构和在井中安装的原理不同分为哪几类？说出各类泵的结构组成？
题型：问答题 简答题
问题：
有杆抽油泵按结构和在井中安装的原理不同分为哪几类？说出各类泵的结构组成？
题型：问答题 简答题
任务型阅读。阅读下列短文，根据短文中的信息完成文后表格。<每空一词)
What is your favorite 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 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-ycar-old boy studied at a famous American music college.
Lang's performances are energetic. 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.
