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 高等继续教育 / 数控加工技术
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题型描述: 单选题

一般情况编程人员在数控编程时所建立的坐标系称为()。

A.编程坐标系
B.工件坐标系
C.机床参考坐标系
D.机床坐标系
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  • 题型描述: 阅读理解The room was dark and still. Only one boy was still awake. He sat on the edge of his bed at a far corner of the room. Slowly and carefully, he made small holes across a piece of paper with a sharp stylus (铁笔). Every two or three minutes he stopped and ran his fingers across the raised dots on the opposite side of the paper. A whisper came from the next bed, “Louis, are you still making dots? You’d better stop and get some rest. The teacher will be angry if you fall asleep in class.” The reply came slowly. “I know. I’m almost finished now. Go back to sleep, Gauthier.” Louis Braille, inventor of the Braille reading system (盲文) for the blind, put his paper and stylus on a table behind his bed. He stood up and walked across the room to an open window. He hardly noticed the cool April wind brushing his face. He knew his system would work despite what others thought.1、 From the passage we know people did not believe Braille would succeed in his work. A. F B. T 2、 The other boy asked Braille to stop because he could not go to sleep with Braille working. A. F B. T 3、 This passage is mainly about how the Braille method was invented. A. T B. F 4、 Braille stopped making dots and ran his fingers across the paper from time to time because he was tired. A. F B. T 5、 Louis and Gauthier were classmates. A. F B. T统考英语A