求新概念英语第二册第七课摘要
题目
求新概念英语第二册第七课摘要
与单选
答案
Lesson 7
Detectives were waiting at the airport all morning.They were expecting a valuable parel of diamonds from South Africa.Two men took the parcel into the Customs House after the arrival of the plane.Two detectives opened it.The parcel was full of stones and sand.
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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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