某单位共有36位工作人员，为改善办工设备，提高工作效率．单位准备为每位工作人员配备一台手提电脑．现有A、B两种型号的手提电脑供选择．根据预算，共需资金145000元．购买一台A 型电脑和两台B型电脑共需资金11840元；购买两台A型电脑和一台B型电脑共需资金12040元．
（1）购买一台A型电脑和一台B型电脑所需的资金分别是多少元？
（2）问该单位最多能购买A型电脑多少台？
（1）设A型电脑x台，B型电脑y台，则
，x+2y=11840 2x+y=12040
解得：
．x=4080 y=3880
答：购买一台A型电脑和一台B型电脑所需的资金分别是4080元和3880元．（6分）
（2）4080x+3880（36-x）≤145000，
解得：x≤26.6．
所以最多26台．
| 阅读理解。 | ||||||||||||||
| Everyone has a dream job and we all hope our dreams can come true. Mr Black works as a reporter at a TV station. He wants to know what jobs teenagers are going to do when they grow up. He went to the Evergreen School to do a survey (调查) last Friday. Mr Black asked the students to discuss with each other and then fill in the form with a pen. He told them to tell the truth. Mr Black thought most students would be teachers. The teacher is one of the best professions (职业) in the world. Maybe some students would be scientists. Rich knowledge would help them. A few students would be soldiers (士兵) because they could keep our country beautiful and peaceful. Teachers helped Mr Black before school was over. They gave out one thousand eight hundred papers to the students. When the survey's result came out, Mr Black and the teachers were surprised. Please look at the results.
| ||||||||||||||
| 1. From the first paragraph, we know this passage may talk about __________. | ||||||||||||||
| A. teenagers' dream jobs B. Mr Black and his job C. how dreams come true D. how to make a survey | ||||||||||||||
| 2. What does Mr Black do? | ||||||||||||||
| A. He is a teacher. B. He is a reporter. C. He is a soldier. D. He is an actor. | ||||||||||||||
| 3. Why did Mr Black do a survey last Friday? | ||||||||||||||
| A. Because he wanted to find a job for himself. B. Because he wanted to know about students' dream jobs. C. Because he was always interested in doing a survey. D. Because he wanted to know how much money teenagers got a week. | ||||||||||||||
| 4. Which of the following did most students choose? | ||||||||||||||
| A. Actor. B. Sports player. C. Teacher. D. Scientist. | ||||||||||||||
| 5. How many teenagers want to be teachers in the future? | ||||||||||||||
| A. 90. B. 360. C. 900. D. 1800. |
缺失，拟以
为基牙单端固定桥修复。该修复设计不适用于（）