倾角为θ的斜面,长为l ,在顶端水平抛出一个小球,小球刚好落在斜面底端,如图所示 发布时间:2017-05-25 12:33 │ 来源:www.tikuol.com 题型:不定项选择 问题: 倾角为θ的斜面,长为l ,在顶端水平抛出一个小球,小球刚好落在斜面底端,如图所示,那么小球的初速度 v0 的大小为[ ]A. B.C. D.
题型:不定项选择 阅读理解。 Bill Gates is head of the software company Microsoft and one of the world's richest men. He was born on October 28, 1955 and grew up in Seattle with his two sisters. He was a very bright boy. Science andmath were his two favorite subjects at school. And he dreamed of being a scientist. Bill first started to play on computers at the age of 13. At that time, a computer was a very large machine.Once he was interested in a very old computer. He and some of his friends spent as much time as possible oncomputers. In the end, they worked out a software program. Bill sold it for 4,200 dollars when he was only 17. In 1973, Bill went to Harvard University. In 1975, Bill and his partners developed a software program called BASIC. This was not the first program ever created, but its inventors were the first to decide that people who wanted to use it should pay for it. BASIC was a success. Then Bill left Harvard to work for Microsoft, acompany he started in 1975 with his boyhood friend Paul Allen. They thought the computer would come intoevery office and every home soon. So they began developing software for personal computers. They improvedthe software to make it easier for people to use computers. After many years of hard work, Microsoft becomes one of the most successful companies. And Bill Gates also becomes one of the richest businessmen in the world. Information about Bill Gates Date of birth: October 28, 1955 Official position: Head of Microsoft Dream job in the childhood: 1. ______________Thing first done in1968: 2. ______________Name of the software program: 3. ______________ Reason for developing personal software: 4. ______________ Achievements: 5. ______________ 查看答案