从信,手机,电脑中任选一个交际方式,写一篇120词英语作文
题目
从信,手机,电脑中任选一个交际方式,写一篇120词英语作文
答案
With the development of science and technology, people have a wider choice of sending greetings to their friends and relatives. The traditional way is to send greeting cards on festive occasions. It t...
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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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