新概念2册第七课的文章!只要文章!
题目
新概念2册第七课的文章!只要文章!
答案
The pland was late and detectives were waiting at the airport all morning .They were expecting a valuable parcel of diamonds from South Afica.A few hours earlier,someone had told the police that thieves would try to steal the diamonds .When the plane arrived ,some of the detectives were waiting inside the main building while others were waiting on the airfield.Two men took the parcel off the plane and carried it into the Customs House .While two detectives were keeping guard at the door ,two others opened the parcel.To theri surprise ,the precious parcel was full of stones and sand!
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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