some kinds of fish release some black liquid to protect themselves from being killed.(保持句意不变)
题目
some kinds of fish release some black liquid to protect themselves from being killed.(保持句意不变)
some kinds of fish protect themselves from being killed _____ ______ some black liquid.
答案
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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