write some rules on buses
题目
write some rules on buses
用简单的英语
像
Don't smoke on buses
答案
Bus rules1.Do not lean on the door.2,Refrain from the use of profane language,tobacco,alcohol,drugs or any other controlled substance on the bus.3.Refrain from eating or drinking on the bus.Help keep ...
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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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