题目内容

韩晓鹏是我国首位在冬奥会雪上项目夺冠的运动员。他在一次自由式化学空中技巧比赛中沿“助滑区”保持同一姿态下滑了一段距离,重力对他做功1900J,他克服阻力做功100J。韩晓鹏在此过程中()。

A. 动能增加了1900J
B. 动能增加了2000J
C. 重力势能减小了1900J
D. 重力势能减小了2000J

查看答案
更多问题

Five Things Nobody Told Me about CollegeAs I type this , I am in my university dorm room. A year ago, when I was awaiting to hear the results of my college applications, I often went to websites for some type of insider look on what college would be like. However, there’s only so much that prep books, websites, and older friends can teach. Here are the top 5things nobody told me about college:61Nobody entering a university knows exactly what they want to study. If they tell you otherwise, they’re lying and will probably change what they want to purse within the first quarter of attendance . During my first quarter at University of California, Riverside (UCR),I thought that I wanted to study Political Science with its focus on International Affairs, so that’s what I applied for. However, once I worked with statewide and local government, I realized that a better fit for me would be Public Policy, and now I am in the process of changing my area.62In college, there are so many good chances for you to meet your expectations. However, there is a very important difference between wanting to do something and applying for something. In order for you to take advantage of the conferences, research, internships ,and fellowships that your university offers, apply! Step into your academic advisor’s office, introduce yourself, and begin making the valuable connections that are necessary to help during the rest of your college career. Great things happen when you step out of your comfort zone, and you would be surprised on how many chances exist if you just ask.63College is where you meet your birdesmaids, neighbors, and potential bosses. The relationships you develop now will probably be linked to the ones you value later, so he wise about the people who you invest yourself in . You are only one person, and you do not have time to waste on people who would rather cause drama or mess up with your purpose. Surround yourself with uplifting individuals who challenge you to be better while loving you for who you are, and be patient to the people who are the complete opposite of that description.64As a first-year, I was afraid to make any noise towards campus issues that I noticed. It was not until I became involved in student government that I gained the confidence to handle projects that I created with the help of ASUCR Office of the President. During my first quarter, I spoke directly to the Chancellor, asking him for support towards my initiavives, met with the Vive Chancellors, and coorerated with my teaching assistances to begin my undergraduate research protect. Nothing good will happen when you are silent.65At my high school,there were about only four active club and organizations that students could be a part of.Imagine my surprise when I stepped foot onto UCR’s capus,where over 400 organizations exist,ranging from political organizations to karate club.You are not paying all or your tuition(学费)to merely go to class,study,pass tests and graduate.Make something worthy out of your experience.Create that you will want to tell your grandchildren one day.It all begins here,by signing up to join an organization. 63()

A. Get involved in student activities
B. Your voice is actually super important
C. There is a significant increase of opportunities
D. Stay in active communication with your friends
E. Get smart about the people who you spend your time with
F. Your major does not matter as much in your first of college

有关DNA分子的研究中,常用32P来标记DNA分子。用α、β和γ表示ATP或dATP(d表示脱氧)上三个磷酸基团所处的位置(A-Pα~Pβ~Pγ或dA-Pα~Pβ~Pγ)。回答下列问题;(1)某种酶可以催化ATP的一个磷酸基团转移到DNA末端上,同时产生ADP。若要用该酶把32P标记到DNA末端上,那么带有32P的磷酸基团应在ATP的()(填“α”“β”或γ”)位上。(2)若用带有32P标记的dATP作为DNA生物合成的原料,将32P标记到新合成的DNA分子上,则带有32P的磷酸基团应在dATP的()(填“α”“β”或γ”)位上。(3)将一个带有某种噬菌体DNA分子的两天链用32P进行标记,并使其感染大肠杆菌,在不含有32P的培养基中培养一段时间。若得到的所有噬菌体双链DNA分子都装配成噬菌体(n个)并释放,则其中含有32P的噬菌体所占比例为2/n,原因是()。

一平行板电容器两极板之间充满云母介质,接在恒压直流电源上,若将云母介质移出,则电容器()。

A. 极板上的电荷量变大,极板间的电场强度变大
B. 极板上的电荷量变小,极板间的电场强度变大
C. 极板上的电荷量变大,极板间的电场强度不变
D. 极板上的电荷量变小,极板间的电场强度不变

在中国文学博物馆,4D电影《甲骨文》向观众展示着甲骨文的产生、发展和演变历程。还原古代生活场景时,影院画面、音响和座椅巧妙配合,带观众穿越数千年,讲述甲骨文字形时,立体图形灵活转换,让观众感受古人造字的智慧。从中看出()。

A. 科技是推动文化发展的决定因素
B. 现代信息技术的运用促进了文化传播
C. 甲骨文的出现,标志着人类进入文明时代
D. 文化与经济相互交融,科技的作用越来越重要

答案查题题库