怎么用英文介绍蹦极这一项极限运动?
题目
怎么用英文介绍蹦极这一项极限运动?
答案
Bungee jumping (also spelled "Bungy" jumping)[1][2] is an activity that involves jumping from a tall structure while connected to a large elastic cord. The tall structure is usually a fixed object, su...
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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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