四年级下册英语手抄报主题my classroom
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四年级下册英语手抄报主题my classroom
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my classroomI'm in Class -(数字),Grade -（数字）.My classroom is not very big,but it is clean.There are many desks snd chairs in it.There are two blackboards on the wall.There is a teacher's desk in f...
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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．
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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