题干

科学家制造出一种使用固体电解质的燃料电池,其效率更高,可用于航天航空.如图所示装置中,以稀土金属材料作惰性电极,在两极上分别通入CH4和空气,其中固体电解质是掺杂了Y2O3的ZrO3固体,它在高温下能传导正极生成的O2.下列叙述错误的是(  )

A:c电极是正极,发生还原反应

B:B口通入的是甲烷,发生氧化反应

C:放电时O2离子向d极移动

D:d极上的电极反应式为:CH4+4O2+8e=CO2↑+2H2O

上一题 下一题 0.0难度 选择题 更新时间:2019-05-07 05:21:28

答案(点此获取答案解析)

D

同类题2

阅读下列短文,根据短文内容,从短文后各题所给的A、B、C、 D四个选项中,选择最佳选项。

How to Be a Better Student

    Maybe you are a common student. You probably think you will never be a top student. This is not necessary so, however. Anyone can become a better student if he or she wants to. Here's how:

Plan your time carefully. When you plan your week, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First set your time for eating, sleeping, dressing, etc. Then decide a good, regular time for studying. Don't forget to set aside enough time for entertainment. A weekly schedule may not solve all your problems, but it will force you to realize what is happening to your time.

    Find a good place to study. Look around the house for a good study area. Keep this space, which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television! When you sit down to study, concentrate on the subject.

    Make good use of your time in class. Take advantage of class time to listen to everything the teachers say. Really listening in class means less work later. Taking notes will help you remember what the teacher says.

    Study regularly. When you get home from school, go over your notes, review the important points that your teacher is going to discuss the next day, read that material. This will help you understand the next class. If you do these things regularly, the material will become more meaningful, and you will remember it longer.

    Develop a good attitude about tests. The purpose of a test is to show what you have learned about a subject. They help you remember your new knowledge. The world won't end if you don't pass a test, so don't be over worried.

    There are other methods that might help you with your studying. You will probably discover them after you have tried these.