向CuO和Fe粉的混合物中加入一定量的稀硫酸,并微热.当反应停止后,滤出不溶物,

题型:多选题

问题:

向CuO和Fe粉的混合物中加入一定量的稀硫酸,并微热.当反应停止后,滤出不溶物,并向滤液中插入一枚铁钉,片刻后,取出铁钉,发现铁钉无任何变化.根据上述现象,确定下面哪个结论是正确的(  )

A.不溶物一定是Cu

B.不溶物一定是Fe

C.不溶物中一定含有Cu,但不一定含有Fe

D.滤液中一定含有FeSO4,但一定不含有CuSO4和H2SO4

考点:金属活动性酸的性质
题型:多选题

下列方程式中,正确的是(  )

A.CH3COOH在水中电离:CH3COOH═H++CH3COO-

B.金属Na投入水中:2Na+2H2O═2Na++2OH-+H2

C.乙酸与乙醇发生酯化反应:CH3COOH+C2H5OH

催化剂
CH3COOC2H5

D.CaCO3高温分解的热化学方程式:CaCO3

 高温 
.
 
CaO+CO2↑,△H=+178.5 kJ/mol

题型:多选题

若设置字段的输入掩码为“####-######”,该字段正确的输入数据是

A.0755-123456

B.0755-abcdef

C.abed-123456

D.####-######

题型:多选题

阅读理解。

     In our old neighborhood, neighbors chatted over fences. Newcomers were welcomed with chocolate

and bread. It had been easy to find friends there. Our new community was different. It seemed that family

roots grew deep, deep as the Mississippi River that flowed past the tiny river town.

    We'd moved to decrease my husband's distance to work. Only thirty miles.

    After living there for six months, I was ready to move back home. I was lonely without a friend. My

three boys were lonely. My husband, Lonny, seemed okay, but he spent his days at work.

     Lonny noticed my sinking disposition.

     "Shawnelle, you look unapproachable," he said. He and I were sitting in lawn chairs. Samuel, our

three-year-old son sat in his own little chair.

     "What do you mean?"  "Body language. You placed our chairs fifteen yards away from everyone

else."

     "It doesn't matter. I'm not going to have friends here." Just then Samuel looked up. "Mom's right,

Dad. And we just want to go home."

     That's when I knew that I needed an adjustment. I didn't want my boys to learn that the way to work

through a tough time was to use a wounded and bitter attitude.

     Over the next few months I smiled when I didn't feel like it. We signed up for reading programs at the

library and often visited parks and the bike path along the river.

     One afternoon Samuel and I climbed up the stairs to the library activity room. A woman who I hadn't

seen before sat at a long table with a tiny boy.

     "Hi," she said. "I'm Tammy. Do you need a seat? There's one right here."

      I sat down next to Tammy. Soon class was over, and we still had a lot to say. "Why don't you come

over later?" Tammy asked. "I live on a farm. There's plenty of room for the kids to run." We went. And

since that day, we've been back a million times.

      When I look back, I'm grateful for that tough time. I learned to persevere. I'm glad I didn't give up.

      And as for my boys, they learned a lesson too. "Keep moving forward," is what I tell them. "Your

heart will follow."

1. Why did the writer move to a new neighborhood?

A. To find a part-time job in the library.    

B. To make new friends with the local people.

C. To enjoy the beauty of the Mississippi River.

D. To make her husband go to work conveniently.

2. Shawnelle decided to keep going when ________.

A. Tammy encouraged her to join conversations

B. Samuel expressed his wish to go back home

C. Lonny pointed out the mistakes of her body language

D. Tammy invited her to go to her farm

3. Shawnelle mentioned her friendship with Tammy to prove_________

A. women seemed to have endless words to say

B. Tammy was rich to have room for kids

C. her family had finally fitted in the new place

D. Tammy's farm was suitable for kids to play on

4. What lesson did Shawnelle teach her kids? 

A. Have a dream in difficult times.          

B. Never break up with old friends.

C. Be careful in making friends.            

D. Keep up in a tough time.

5. What does the underlined word disposition in the fourth paragraph probably mean?

A. mood          

B. sorrow        

C. depression        

D. livelines

题型:多选题

下列选项中()是操作体系的要素。

A、自主管理

B、安全制度

C、“三违”整治

D、隐患排查

题型:多选题

《 * * 管理条例实施细则》规定,彩民弃奖奖金纳入(),归地方政府使用。

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