题干

铁镍蓄电池放电时的总反应式为Fe+Ni2O3+3H2O═Fe(OH)2+2Ni(OH)2,下列有关该电池的说法正确的是(  )

A:电池的负极为Ni2O3,正极为Fe

B:电池的电解液可能是碱性溶液,也可能是酸性溶液

C:电池放电时,正极反应式为 Ni2O3+3H2O+2e− ═ 2Ni(OH)2+2OH−

D:电池充电时,阳极附近溶液的pH升高

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答案(点此获取答案解析)

C

同类题2

近年来,互联网技术迅猛发展,快速融入并深刻改变了百姓的日常生活。

材料一:“互联网十回收”在创造经济效益的同时,也让循环经济理念深入人心。在北京市某地铁站,高女士将自己手中的空矿泉水瓶投进某公司设在站口的“饮料瓶回收机”中,机器屏幕上显示该瓶的品类,并提示高女士“您投入的是第5977458个瓶子”。随后,在“手机话费、一卡通充值、优惠券”等“返利”方式中,高女士选择了“手机话费”,在输入自己的手机号码后0.1元就到账了。饮料瓶回收后,会实现“瓶到瓶的循环”,即从智能回收、专业分拣打包到深层清洗净化,生成再生食品级聚酯切片,这些切片可加工为再生瓶,进入市场流通。

材料二:“互联网十政治”为公民参与政治生活提供了广阔的平台,也给社会治理模式的创新带来了新的机遇。公民通过社交网络为交管部门提供道路拥堵信息;民间环保组织依据政府公开的环境数据绘制“污染地图”,帮助政府监管污染企业;市政府通过门户网站向市民征集建议;城管部门请商户和市民通过网络平台为执法人员的工作打分……公民与政府通过“互联网+”在越来越多的社会公共领域中形成合力。

材料三  “再不创业就老了!”凭着对互联网新技术的敏感和青春的激情,越来越多的年轻人加入“互联网+”创业的大军。对于这些年轻人来说,进行“互联网+”创业,最难的可能并不是“互联网”的这一部分,“+”号后面的那部分以及怎么“+”或许才是更难搞定的。

同类题5

阅读短文,根据其内容回答问题。
   The Internet is becoming more and more important in our life. You can get a lot of information, make friends. share your ideas, send emails and chat at any time or anywhere. However, imagine you receive an email that looks something like this: ARE YOU GOING TO CLASS TODAY? How does reading this message make you feel? Why did the sender use all capital(大写) letters? Was he or she angry, or did that person just forget to turn off the "Cap lock" on the computer? The fact is, using all capital letters in an email means that people shout online. Virginia Shea' s book, Netiquette, lists some ways of communicating(交流) properly with others on the Internet. Following are some of her suggestions.
   ◆First, always remember that you are sending messages to a real person, not just to a computer. Don't write anything that you wouldn't say to someone's face. Also, remember that the receiver cannot hear your voice, or see the expression(表情)on your face, so make sure your meaning is clear.
   ◆Don’t do anything online that you wouldn’t do in real life. Don’t take anything without paying for it . Don’t use information that someone else has written, and say it's yours. Don’t read other people’s email—you wouldn't open your next –door neighbor’s mailbox and open their mail, right? Do share your knowledge of the Internet with others. It’s a big place with lots of information, and there are many new things to discover.
   ◆Remember that people judge(判断) you by your words as well as your actions, so do try to write well. Send polite, well-written email messages to others. If you’re not sure about how to spell a word or which phrase to use, look it up. There are lots of helpful books and websites.
   ◆It's OK to share your ideas online like chat rooms or message boards, but don't argue(争吵) with people . ‘Flame wars' in online discussions can be interesting to read, but are often unfair(不公平) to other members of the group. Share your ideas, but remember that fighting on or offline is just not correct.
   When you're online, just as in "real" life, try to respect (尊重) other people's space and feelings. Remember, you're not the only one traveling on this highway!