对个人投资者申购和赎回开放式证券投资基金单位取得的价差收入，（）印花税。 A.免征

下列物质①Cu②液态SO₂③纯醋酸④NaHCO₃⑤Ba（OH）₂溶液

I、属于非电解质的是______；（填序号）

Ⅱ、（1）NaHCO₃是一种______（填“强”或“弱”）电解质；

（2）写出HCO₃^-水解的离子方程式：______；

（3）常温下，0.1mol•L^-1NaHCO₃溶液的pH大于8，则溶液中Na⁺、HCO₃^-、H₂CO₃、CO₃^2-、OH^-五种微粒的浓度由大到小的顺序为：______．

（4）常温常压下，空气中的CO₂溶于水，达到平衡时，溶液的pH=5.60，c（H₂CO₃）=1.5×10^-5mol•L^-1．若忽略水的电离及H₂CO₃的第二级电离，则H₂CO₃⇌HCO₃^-+H⁺的平衡常数K₁=______．（已知：10^-5.60=2.5×10^-6）

Ⅲ、Ba（OH）₂是一种强电解质，现有25℃、pH=13的Ba（OH）₂溶液．

（1）该Ba（OH）₂溶液的物质的量浓度为______；

（2）溶液中由水电离出c（OH^-）=______；

（3）与某浓度盐酸溶液按体积比（碱与酸之比）1：9混合后，所得溶液pH=11（假设混合溶液的体积等于混合前两溶液的体积和），该盐酸溶液的pH=______．

Ⅳ、醋酸是一种弱电解质．某温度下，相同pH值的盐酸和醋酸溶液分别加水稀释，平衡pH值随溶液体积变化的曲线如右图所示．则图______（填“I”或“Ⅱ”）为醋酸稀释的图象．

炮制对芫花化学成分有何影响？

土地市场是国家的重要市场，按照市场体系的分类，它应属于( )。

A．生产要素市场
B．技术市场
C．商品市场
D．产权市场

When I was looking for a Christmas present for my daughter in a toy store, a nicely dressed little girl, with some money in her little hand, was looking at some beautiful dolls. When she saw a doll she liked, she would ask her father if she had enough money. He usually said yes.

At the same time, a boy, with old and small clothes, was looking at some video games. He, too, had money in his hand, but it looked no more than five dollars. Each time he picked up one of the video games and looked at his father, he shook his head.

The little girl had chosen her doll, a very beautiful one. However, she noticed the boy and his father. She saw the boy give up a video game with disappointment and walk to another corner of the store.

The little girl put her doll back to the shelf and ran over to the video game. After she talked to her father, she paid for the video game and whispered(耳语) to the shop assistant.

So the boy got the video game that he wanted for free—he was told it was a prize from the store. He smiled happily, although he felt it was so incredible. The girl saw all this happen. She smiled, too.

When I walked out of the store to my car, I heard the father ask his daughter why she had done that. I would never forget their short talk. " Daddy, didn’t Grandma want me to buy something that would make me happy"

He said, "Of course, she did. "

"Well, I just did!" With that, the little girl started skipping towards their car happily.

The story happened in a ().

A．school

B．toy store

C．cinema

D．computer room

虚拟局域网是建立在( )之上的。

A．以太网

B．令牌环网

C．共享介质网

D．局域网交换机