The teacher told them since light travels fast than sound ,lighting appears to go before thunder
题目
The teacher told them since light travels fast than sound ,lighting appears to go before thunder
1lighting为什么加ing light不是名词吗 2to go
答案
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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