the water pollution became more and more serious ( )no further action had been taken Aas if B unless
题目
the water pollution became more and more serious ( )no further action had been taken Aas if B unless C since D even if
答案
A假如没有进一步的行动被实施,水污染会变得越来越可怕
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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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