Are all your photographs good?Be honest with yourself.Aren’t some of your pictures too dark,and othe
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Are all your photographs good?Be honest with yourself.Aren’t some of your pictures too dark,and others too light?How many times have you thrown away a photo?We,the Fine Photograph Club,can help you.We meet every Wednesday in our comfortable club room in Bridge Street.At 7:30 p.m.a member of the club or a visitor would give a talk,and then we have coffee.Our members will advise you on all the latest cameras and films.They will help you to develop your films or enlarge your pictures.What does it all cost?Only 5 pounds a year.Photography is now a big business.Do you know,for instance,that there are 15 million cameras in our country?And that 700 million photographs are taken a year,more than one-third of them in color?Think of the amount of photography in television,the cinema,newspapers,books,advertisements and so on.In modern life people learn a lot from pictures,so photography is more and more important.It is also more complicated and more expensive than it used to be.You may only want
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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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