the spread of deserts is creating a dust bowl that may not only be compared with _of the American
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the spread of deserts is creating a dust bowl that may not only be compared with _of the American
west in the 1930s 为什么空格里填that 他代指的不是bowl吗 代指哪一个怎么分辨
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举一反三
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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