问题
填空题
力偶在任一坐标轴上的投影等于（）。
答案
参考答案：零
搜题请搜索小程序“爱下问搜题”
力偶在任一坐标轴上的投影等于（）。
参考答案：零
| 阅读理解。 |
| One day, a little boy came to a shop and said to the shop assistant, "I want to buy twelve exercise- books of 10 cents and nine pencils of 15 cents, four pieces of rubbers of 20 cents. How much shall I pay?" The shop assistant wrote all numbers down on a piece of paper and calculated (计算). Then she said, "You should pay 3.35 dollars altogether." "If I give you 5 dollars, how much shall I get back?" "You'll get back 1.65 dollars. Shall I pack these things for you?" "No, I don't buy anything" the boy looked at the piece of paper and said politely. "This is my maths homework. Can I take the answer away?" |
| 1. _____ kinds of things are mentioned (提到) by the boy. A. One B. Two C. Three D. Four 2. The boy went to the shop _____. A. to buy something for his school B. to buy something for his home C. to see how many things the shop has D. to get an answer 3. Nine pencils of 15 cents is _____. A. $ 1.35 B. $ 1.65 C. $ 0.15 D. 2.15 4. The shop assistant asked the boy to pay _____ after she answered boy. A. nothing B. $ 3.35 C. $ 1.65 D. $ 5 5. the boy bought _____ at last. A. nothing B. nine pencils C. twelve exercise-books D. four pieces of rubbers |