作文 题目是how to keep safe in school
题目
作文 题目是how to keep safe in school
答案
Do you know our school life could be dangerous if we are not careful enough.For example,one day,two students ran after each other in the hallway.Suddenly,one of them fell down and hurt his leg because...
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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