螺杆泵振动的原因是什么？
题型：问答题 简答题
问题：
螺杆泵振动的原因是什么？
题型：问答题 简答题
阅读下面短文，并借助上下文和插图补充所缺信息。每个空只能填写一个形式正确、意义相符的单词。
"Daddy, can I learn to play the (1) _______? I'll try very hard." Sarah asked her (2)_______, Mr White.
"All right," Mr White said. "I'll (3)_______ for you to have lessons for six weeks. If you play well, you
can go on with your lessons. If you don't, I will (4)_______ the lessons."
"OK, Daddy," Sarah said.
Mr White found her a good and expensive (5)_______ and Sarah began her lessons.
Six weeks later, Sarah said to Mr White, "I'm (6)_______ to play for you, Daddy."
"Fine, Sarah," Mr White said."Begin."
She began to play. She didn't play well. She made a terrible noise.
Her father had one of his friends with him. The friend put his hands over his (7)_______ when he heard
the noise.
When Sarah (8)_______, her father said,"Well done, Sarah. You can go on with your lessons."
Sarah ran happily out of the room. Mr White's friend turned to him."You've spent a lot of (9)_______,
but she still plays very (10)_______," he said.
Mr White said, "Since she started learning the piano, I've been able to buy five apartments (单元房间) in
this building very cheaply. In another six weeks, I'll own the whole building."