大家庭与小家庭的优缺点 英语作文
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大家庭与小家庭的优缺点 英语作文
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Do you prefer a big family or a small family?if i have a big family but no one living together with me,or they don't like me at all,my birth was not they expected,sounds poor.i just prefer a family wh...
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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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