is this a chair?(用couch改为选择凝问句)
题目
is this a chair?(用couch改为选择凝问句)
答案
Is there a desk or a chair?这里and 要改成or Is thereis a very nice and clean.I My Room This is my room.It is
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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