问题
问答题 简答题
攻丝前的圆杆杆直径怎样确定？
答案
参考答案：
套丝过程中，板牙对工件螺纹部分材料也有挤压作用，因此圆杆直径应比螺纹外径小一些。一般选圆杆的最小直径为螺纹的最小直径，最大直径约等于螺纹的最小直径加上螺纹外径公差的1/2。
圆杆直径用经验公式计算D=d–0.13t
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攻丝前的圆杆杆直径怎样确定？
参考答案：
套丝过程中，板牙对工件螺纹部分材料也有挤压作用，因此圆杆直径应比螺纹外径小一些。一般选圆杆的最小直径为螺纹的最小直径，最大直径约等于螺纹的最小直径加上螺纹外径公差的1/2。
圆杆直径用经验公式计算D=d–0.13t
| 阅读理解。 | ||||||
| ||||||
| 1. In the passage, _____ is the youngest player. | ||||||
| A. Pele B. Yao Ming C. Steffi Graf D. Martina Navratilova | ||||||
| 2. _____ comes from South America. | ||||||
| A. Pele B. Yao Ming C. Steffi Graf D. No one | ||||||
| 2. _____ comes from South America. | ||||||
| A. Pele B. Yao Ming C. Steffi Graf D. No one | ||||||
| 4. Which of the following is WRONG? | ||||||
| A. Pele was born in a poor family. B. Pele was a great football player. C. Pele played football in the street all his life. D. Pele became famous soon after he was picked to play for Santos. | ||||||
| 5. From the passage, we know that _____. | ||||||
| A. Martina Navratilova was also a tennis player B. Steffi Graf was born in Wimbledon in 1985 C. Steffi Graf won the tennis final when she was only 16 D. Steffi Graf has won few of the main matches since 1985 |
