1.China have identified the goal for the first 20 years of this century.
题目
1.China have identified the goal for the first 20 years of this century.
分析句子结构
答案
China have identified the goal for the first 20 years of this century中国已经确定了本世纪头前20年的目标China 主语,have identified动词的完成时态充当谓语,the goal 宾语,for the first 20 years of this cen...
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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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