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【单选题】
据媒体报道：以氢氧燃料电池为动力的公交车即将在北京试运行．质子交换膜燃料电池（PEMFC）常作为电动汽车的动力源．该燃料电池以氢为燃料，空气为氧化剂，铂为催化剂，导电离子是氢离子．下列对该燃料电池的描述中正确的是（　　） ①正极反应为：O 2 +4H + +4e - ═2H 2 O  ②负极反应为：2H 2 -4e - ═4H + ③总的化学反应为：2H 2 +O 2 ═2H 2 O    ④H + 通过电解质向正极移动．
A.
①②③④
B.
②③④
C.
①②④
D.
①②③
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参考答案：
举一反三
【单选题】________ T V program do you like best?
A.
which
B.
who
C.
what
D.
when
查看完整题目与答案
【简答题】Homework 2: Discuss the following questions with your group members. Take a video to show your discussion in your group. What has impressed you most about Brenda? Is there anyone around you like Brend...
查看完整题目与答案
【单选题】T V program do you like best?
A.
Who
B.
What
C.
Whose
D.
Which
查看完整题目与答案
【判断题】在线学习活动是在线教育学与教再度整合的桥梁，也是在线教学中教师、学生和各种要素相互联系的桥梁。
A.
正确
B.
错误
查看完整题目与答案
【单选题】等长运动时，膝屈曲产生最大肌力的角度是
A.
15°
B.
30°
C.
45°
D.
60°
E.
90°
查看完整题目与答案
【多选题】To be a good and happy person, you should:
A.
end suffering
B.
create equality
C.
challenge oppression
D.
distribute wealth and be generous
查看完整题目与答案
【单选题】---Do you know if Linda is willing to take charge of the program? ---_______, does it?
A.
It makes no time
B.
It counts for nothing
C.
It doesn’t hurt to ask
D.
It doesn’t make sense
查看完整题目与答案
【多选题】A signal to the end should be included in the presentation conclusion, because it can _____________.
A.
wake up the audience
B.
reset the focus
C.
leave a good impression
D.
clarify the structure
查看完整题目与答案
【简答题】A: Good afternoon, Mr. White. W: Hi, Ashley. You are here for our , right? A: Yes. I will be happy if my suggestions are . W: What theme do you think we should adopt for our booth? A: The theme is mai...
查看完整题目与答案
【单选题】________ T V program do you like best?
A.
Who
B.
What
C.
Which
查看完整题目与答案
相关题目：
【单选题】________ T V program do you like best?
A.
which
B.
who
C.
what
D.
when
查看完整题目与答案
【简答题】Homework 2: Discuss the following questions with your group members. Take a video to show your discussion in your group. What has impressed you most about Brenda? Is there anyone around you like Brend...
查看完整题目与答案
【单选题】T V program do you like best?
A.
Who
B.
What
C.
Whose
D.
Which
查看完整题目与答案
【判断题】在线学习活动是在线教育学与教再度整合的桥梁，也是在线教学中教师、学生和各种要素相互联系的桥梁。
A.
正确
B.
错误
查看完整题目与答案
【单选题】等长运动时，膝屈曲产生最大肌力的角度是
A.
15°
B.
30°
C.
45°
D.
60°
E.
90°
查看完整题目与答案
【多选题】To be a good and happy person, you should:
A.
end suffering
B.
create equality
C.
challenge oppression
D.
distribute wealth and be generous
查看完整题目与答案
【单选题】---Do you know if Linda is willing to take charge of the program? ---_______, does it?
A.
It makes no time
B.
It counts for nothing
C.
It doesn’t hurt to ask
D.
It doesn’t make sense
查看完整题目与答案
【多选题】A signal to the end should be included in the presentation conclusion, because it can _____________.
A.
wake up the audience
B.
reset the focus
C.
leave a good impression
D.
clarify the structure
查看完整题目与答案
【简答题】A: Good afternoon, Mr. White. W: Hi, Ashley. You are here for our , right? A: Yes. I will be happy if my suggestions are . W: What theme do you think we should adopt for our booth? A: The theme is mai...
查看完整题目与答案
【单选题】________ T V program do you like best?
A.
Who
B.
What
C.
Which
查看完整题目与答案
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