can a changed cancer cell attack another cancer cell?
题目
can a changed cancer cell attack another cancer cell?
thanks for all your concern and your answers...
by the way,I 'm a student who learn bio-pharmacy in English...so,I little bit difficult to me ...and the only reason why I speak English just want to practise my English.I'm sorry if I make you misunderstanding...
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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