啄木鸟英文介绍
题目
啄木鸟英文介绍
用英文介绍下卓啄木鸟 三十到四十个词
答案
Woodpeckers are known for pecking holes in tree bark to find insects to eat.Most woodpeckers live in forests,spending their lives mainly in trees.There are about 180 species of woodpecker.They include...
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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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