2016年4月2日，漫画作家喃东尼的漫画“友谊的小船说翻就翻”在微博“企鹅北游记”发出，随配文字、形象呆萌的企鹅系列图片当天就有78000余次转发。喃东尼在微信公众号上透露，很多账号使用漫画不署名不标明出处更加没有申请授权。喃东尼被侵犯了（    ）

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如图所示，一个长直轻杆两端分别固定一个小球A和B，两球质量均为m，两球半径忽略不计，杆的长度为。先将杆AB竖直靠放在竖直墙上，轻轻振动小球B，使小球B在水平面上由静止开始向右滑动，当小球A沿墙下滑距离为$\frac{l}{2}$时，下列说法正确的是(      )

   My name is Chen Lan. My home is in Gulangyu. Do you know it? It is in Xiamen. It is near the sea(海). Gulangyu is a small place，but it is very nice and clean. There are no cars，no buses. People only walk. So it is very quiet.
   Our house is in the middle of Gulangyu. Behind our house there is a big old tree. My grandfather tells me that the tree is very，very old. There are many birds in the tree. We call it a “bird tree”. Our house is near the sea. The sea is big and blue. There are a lot of fish in the sea. After school，I go there and catch(捉) fish with my friends. It is very interesting. I like fish and I like catching fish.