七年级英语作文介绍自己或朋友的体育用具.要求不少于40词.
题目
七年级英语作文介绍自己或朋友的体育用具.要求不少于40词.
答案
I have a pair of dumb bells which were the birthday gift from my uncle.They are very heavy,each weighs 10 kg.At the begining I could hardly left them,let alone doing any exercise with them.The reason ...
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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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