网上购物的好处英语作文
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网上购物的好处英语作文
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Advantages:Will greatly save shopping time, while listening to light music enjoying the fun of shopping online. Moreover, gifts can also be sent to friends you want, directly from the Internet after o...
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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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