英语作文《吸烟》
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英语作文《吸烟》
关于吸烟有害健康的英语作文!
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Today smoking is a widespread habit ali over the world.Not only the old,the youth,but also middle school students have been engaged in smoking.Many of them think that smoking is a smart symbol.However...
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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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