问题
选择题
在国际单位制中，力学基本单位有三个，这三个基本单位是（ ）
A．m、kg、s
B．m、s、N
C．m、kg、N
D．kg、s、N
答案
在力学中，质量、长度及时间作为基本物理量，其单位作为基本单位，分别为kg、m、s，所以A正确
故选A．
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在国际单位制中，力学基本单位有三个，这三个基本单位是（ ）
A．m、kg、s
B．m、s、N
C．m、kg、N
D．kg、s、N
在力学中，质量、长度及时间作为基本物理量，其单位作为基本单位，分别为kg、m、s，所以A正确
故选A．
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| Have you ever asked yourself why children go to school? You will probably 1 they go to learn language, geography, history, science and all the other subjects. That is quite true. But 2 do they learn these things? We send our children to school to prepare them for their future work and life. Nearly 3 they study at school has some practical use 4 their life, but is that the 5 reason they go to school? There is 6 in education than just learning facts. We go to school to learn 7 to learn. So when we have left school we can go on learning. If a man really knows how to learn, He will always be successful, because whenever he has to do something new, he will quickly teach himself how to do it in the best way. On the other hand, the uneducated person 8 do it, or does it badly. So the purpose of school is not just 9 languages, geography, science, but to teach pupils the best 10 to learn. | ||||
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