问题
单项选择题
下列关于定位误差的理解，下列说法中正确的是（）
A.夹具定位元件精度高，定位误差不会超差
B.工件定位表面精度高，定位误差就不会超差
C.设计基准和定位基准重合就不会有定位误差
D.工序基准沿工序尺寸方向有变动量就有定位误差
答案
参考答案：D
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下列关于定位误差的理解，下列说法中正确的是（）
A.夹具定位元件精度高，定位误差不会超差
B.工件定位表面精度高，定位误差就不会超差
C.设计基准和定位基准重合就不会有定位误差
D.工序基准沿工序尺寸方向有变动量就有定位误差
参考答案：D
| 阅读理解。 |
| George was very stingy (吝啬的). He hated spending money. Whenever he had to buy something, he always argued about the price and tried to bargain (讨价还价), even for the cheapest things. If he wanted to buy a bottle of coke, for example, and the shopkeeper asked for $2, George would say, "Make it $1.90 and I'll buy it." Sometimes the shopkeeper agreed to reduce (降低) their prices a little. "What's ten cents?" they asked themselves."If it makes this man happy, then it won't hurt me very much." In this way George saved a few cents here and a few cents there, and by the end of the year, he had saved several hundred dollars. One day he had a very bad toothache and had to go to the dentist. The dentist looked at the tooth and said, "This tooth will have to come out. It's too damaged (损坏的) to save." "How much do you charge (要价) to take out a tooth?" George asked. "Forty dollars." the dentist said. "Forty dollars!" George thought this was much too expensive. "How long will it take you to pull out the tooth?" he asked. "About two minutes," the dentist said. George could not believe what he was hearing. "Forty dollars for two minutes' work!" he shouted. "That's robbery (抢劫)." The dentist smiled. "You're right," she said. "Thank you for telling me. I'll pull your tooth out very slowly. What if I take half an hour?" |
| 根据短文，将右栏内容与左栏搭配完成句子，并将字母编号填入题前括号内。 |
| ( )1．George was always ( )2．When he had a toothache ( )3．He became quite angry ( )4．George thought ( )5．The dentist suggested | A．$40 for two minutes' work was robbery. B．that she spend more time pulling out the tooth. C．he went to the dentist. D．trying to save money. E．when the dentist wanted to charge him $40. |
| 根据短文内容，判断正（T）误（F）。 ( )6．George always argued about the price, but not for the cheapest thing. ( )7．The shopkeepers agreed to give George a discount (打折扣) at times. ( )8．George could save little money by asking for reduced prices. ( )9．George thought forty dollars was very expensive for pulling a tooth out. ( )10．What the dentist said would make George very happy. |