下列有关以KOH溶液为电解液的氢氧燃料电池的叙述不正确的是

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A：正极反应式为：O₂ + 2H₂O +4e^- =4OH^-

B：工作一段时间后，电解液中KOH的物质的量浓度不变

C：该燃料电池的总反应式为：2H₂+O₂=2H₂O

D：用该电池电解CuCl₂溶液，产生2.24LCl₂（标准状况）时，有0.2mol电子转移

上一题下一题 0.0难度选择题更新时间:2020-03-19 08:01:41

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B

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Subject: Mobile phone problem

Dear Editor,

I am a middle school student. I used to bring a mobile phone with me during school hours. But the teachers think using mobile phone is distraction (分散注意力的事) to students during school hours and also causes so much trouble in class. So now we aren't allowed to bring mobile phones to school.

I find it really inconvenient (不方便的)。 My parents feel unhappy because they can't get in touch with me(不能与我有联系) . But I can't make our school change this rule. What do you think I should do to solve this problem?

Liu Fengyi

Liu fengyi's occupation (职业)	____
Purpose (目的) for writing the e-mail	____
The school rule	Students aren't allowed to ____
Thing that Liu Fengyi used to do	She used to ____
Reason(原因) why Liu Fengyi's parents are unhappy	They can't ____

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