讲一讲你最喜欢的科目英语作文
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讲一讲你最喜欢的科目英语作文
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I like English most because i think English is widely used in the world .No matter where you go .you can make yourself understood as long as you speak English. It is also the formal language of the go...
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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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