采用缸筒固定安置，工作台的移动范围为活塞有效行程的（）
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How did Liu Wei lose his arms?
A. He touched a high-voltage wire during a game.
B. He played hide-and-seek with his friends and fell from a high place.
C. He was caught in a fire accident.
What did his parents do after he lost his arms?
A. They gave up on him.
B. They encouraged him to learn to take care of himself.
C. They did everything for him to take good care of him.
What did his first teacher think of his future of learning to play the piano?
A. He believed it impossible for someone to play with their toes.
B. He thought it was not so difficult for Liu Wei to learn it well.
C. He thought Liu Wei could become a pianist with his help.
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