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最佳答案:为什么要上大学There are many advantages to a college or university education.Students h
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最佳答案:为什么要上大学There are many advantages to a college or university education. Students
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最佳答案:1.Firstly,we can learn many knowledge which will be helpful in future.2.Secondly
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最佳答案:是啊,棒上速度大小与其距离旋转点之距成正比,比例为角速度,所以要用微积分积积I=∫r??·dm=∫r??·(m/l)·dr=(m/l)∫r??·dr=(m/l)