动物如何听到声音?
题目
动物如何听到声音?
答案
1.When we talk about ears,we usually mean the oddly wrinkled appendages on the side of our heads.2.We are aware that at the end of the central hole in this outer ear there is something called the midd...
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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．
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