H ello I did like to speak to jack 选择 A Yes Im jack B This is jack speaking Its me here 选哪个啊
题目
H ello I did like to speak to jack 选择 A Yes Im jack B This is jack speaking Its me here 选哪个啊
答案
选 B This is jack speaking
这是电话用语,在实际打电话中还可以说成,jack speaking
举一反三
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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