你的朋友对你说Good morning.你应该说？（）

题干

A：Happy birthday.

B：Good bye.

C：Good morning.

上一题下一题 0.0难度选择题更新时间:2020-01-15 11:47:11

C

废旧锂离子电池的正极材料试样（主要含有LiCoO₂及少量Al、Fe等）可通过下列实验方法回收钴、锂．

（1）在上述溶解过程中，S₂O₃²ˉ被氧化成SO₄²ˉ，LiCoO₂在溶解过程中反应的离子方程式为　____ ．

（2）除杂时通入空气的目的____ ，所得的废渣成分为____ ．从废渣中获得Al₂O₃的部分流程如图甲所示，括号表示加入的试剂，方框表示所得到的物质．则步骤I需要的玻璃仪器有____ ，步骤Ⅱ中反应的离子方程式是

____

（3）工业上，将Li₂CO₃粗品制备成高纯Li₂CO₃的部分工艺如图乙．

a．将Li₂CO₃溶于盐酸作电解槽的阳极液，LiOH溶液作阴极液，两者用离子选择透过膜隔开，用惰性电极电解．

b．电解后向LiOH溶液中加入过量NH₄HCO₃溶液，过滤、烘干得高纯Li₂CO₃．

①a中，阴极的电极反应式是　____ ．

②b中，生成Li₂CO₃反应的化学方程式是　____ ．

根据表格内容，回答问题。

Paul	I have been a volunteer as a French teacher for three months and it was a great experience to teach French. I really enjoyed it and I also improved my French.
Helen	During my college days, I joined a group called ROS (Reaching Out Society). We provide children and older people with food. It feels great to help other people. And now, I often give food to the homeless people in the street.
Mike	I'm volunteering at an animal shelter (动物收容所) that's just for cats. I feed the cats and play with them. It's very fun. I was also volunteer at a hospital for a little more than 2 years. I answered phone calls, looked after patients and helped nurses. I did some cleaning too.
Marian	I did volunteer work to graduate from high school. It was a requirement(资格). I volunteered at a school for disabled kids. I played basketball and other sports with them and served food and drinks. It was actually pretty cool. If I weren't so busy now, I'd do it again.