英语作文keeping safe(at homeschoolon rode
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英语作文keeping safe(at homeschoolon rode
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keeping safe in schoolLife is very important and precious for everybody.There is one thing that we should pay attention.Our school life could be dangerous if we are not careful enough.For example,one ...
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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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