海豚的英文文章,
题目
海豚的英文文章,
要好背的,四分钟,70个字
答案
My favourite animal Dolphin is my favourite animal. Dolphins live in the sea. They live on fish, shrimps and so on. Dolphins are very friendly and peaceful. They never attack people. Instead, they ha...
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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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