在测定“小灯泡电功率”的实验汇总，电源电压为4.5V，小灯泡额定电压为2.5V、电阻约为10欧．

下列属于化学变化的是（   ）

根据短文内容理解，选择正确答案。    Hi, I'm Brian. This is the photo of my family. My grandfather is with glasses. He has little hair. The one standing next to him is my uncle. He is wearing a cap. My grandmother has gray hair. She is a kind woman. She is holding my younger brother. He has short curly hair. The woman standing behind me is my mom. She has straight brown hair. There is a little girl sitting on the table. Her name is Cathy. She is my sister. She is wearing a green T-shirt and a pair of green socks. It's her favorite color. Which one is my father? Well, he is wearing glasses, too. He is in brown shorts and brown shoes. His name is Sam. Now, do you know where he is?

             

临沂市某校九年级学生李浩特别关心家乡的建设和发展，经常通过博客展示自己的所见所闻。让我们来共同分享。

博客一：在市政府的鼓励和扶持下，我市个人兴办的企业越来越多，有的已成为纳税大户；我家创办的板材厂，效益也不错。大家都对企业的发展前景充满信心！

1. 博客二：赵志全是鲁南制药集团股份有限公司董事长、总经理。他带领干部员工艰苦创业，把一个濒临倒闭的小厂发展成为一家总资产１００亿元的大型综合制药企业集团。作为国家大型医药企业老总，赵志全强化行业自律，坚决杜绝虚假医药广告。２０１４年１１月１４日深夜，年仅５８岁的他批阅完最后一份关于企业改革与发展的文件，再也没能醒过来。
   

 博客三：2014年以来，临沂市政府开展城区露天烧烤集中整治．要求城区各烧烤经营业户必须更换使用环保无烟烧烤炉具，油烟排放符合相关标准；沿街烧烤门店必须具备室内经营条件．不得从事露天烧烤经营．禁止设置沿街露天烧烤摊点．