【单选题】
车床导轨对加工精度影响最大的是___
A. 水平面内的直线度
B. 垂直面内的直线度
C. 前后导轨的平行度
D. 垂直面内的跳动
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答案
A
解析
暂无解析
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【单选题】
___指的是应尽可能选择同一组精基准加工工件上尽可能多的加工表面，以保证各加工表面之间的相对位置关系。
A. 基准重合原则
B. 基准统一原则
C. 自为基准原则
D. 互为基准原则
【单选题】
自为基准是以加工面本身作为精基准，多用于精加工或光整加工工序中，这是（ ）。___
A. 符合基准统一原则
B. 符合基准重合原则
C. 能保证加工面的余量小而均匀
D. 能保证加工面的形状和位置精度
【单选题】
铣削速度取15m/min，刀具直径为80mm，则主轴转速应该为（ ）。___
A. ≈60r/min
B. ≈100r/min
C. ≈160r/min
D. ≈200r/min
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【单选题】
Q1: What does the man suggest that the woman do this weekend?___
A. Read J .K .Rowling's first book .
B. Go to buy a new Harry Potter book .
C. Watch BBC news about J .K .Rowling .
D. Take her cousin to see a new Harry Potter movie .
【单选题】
Q2: Where did J. K. Rowling come up with the idea for Harry Potter?___
A. At a cafe .
B. On a train .
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【单选题】
Q3: What are J. K. Rowling’s future plans?___
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D. She said she would work on more serious subjects .
【单选题】
Q4: What are the two speakers mainly talking about?___
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【单选题】
Q1: What happened when Stephen tried to remove a bottle of milk from the refrigerator?___
A. He broke the milk bottle .
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C. He made a mess inside the refrigerator .
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【单选题】
Q2: What did Stephen’s mother do when she came into the kitchen？___
A. She gave him a long lecture .
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【单选题】
Q3: What did Stephen’s mother teach him later?___
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【单选题】
Q4: What did Stephen learn from this experience?___
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【单选题】
Q1: Why is surfing the man’s favorite activity?___
A. Because he likes the sunny weather.
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C. Because it can help solve his sleeping problem .
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【单选题】
Q2: What is the woman going to do this weekend?___
A. To go sailing .
B. To go surfing .
C. To go to the beach .
D. To go to her nephew's .
【单选题】
Q3: What does the woman love doing?___
A. Going to visit relatives.
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【单选题】
Q4: What does the man remember doing with his brothers?___
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【单选题】
Q1: According to the survey, what percentage of British adults watched TV in theirfree time?___
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【单选题】
Q2: Which age group would be the most likely to visit their friends and relatives?___
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【单选题】
Q3: What does the speaker say about listening to music as a leisure activity for British people?___
A. People aged 16 to 24 preferred listening to music most .
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【单选题】
Q4: According to the survey, how are leisure activities related to age?___
A. Older people go out to pubs more often . frequently .
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【单选题】
Q1: Why was the girl excited?___
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【单选题】
Q2: What happened when the man was 13 years old?___
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【单选题】
Q3: Why did the man’s mom give him a big hug?___
A. To make him feel better after he lost the first prize .
B. To apologize for not buying him some ice cream .
C. To wish him good luck in the next competition .
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【单选题】
Q4: What color is the girl going to wear for her next competition?___
A. Red .
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【单选题】
Q1: What is this passage mainly about?___
A. Superstitions and science .
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【单选题】
Q2: According to the passage, what is considered as bad luck?___
A. Walking under a ladder .
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