关于天气的英语作文
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关于天气的英语作文
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关于春天天气的英语作文The spring rain has been falling gently since morning.Some swallows were busily flying about to and fro amidst the rain.The peach blossoms in the garden were beaten by the rain a...
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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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