将0.2mol/L的醋酸与0.2mol/L醋酸钠溶液混合,已知Ka=1.76×10-

题型:单项选择题

问题:

将0.2mol/L的醋酸与0.2mol/L醋酸钠溶液混合,已知Ka=1.76×10-5,为使溶液的pH值维持在4.05,则酸和盐的比例应为()。

A.6:1

B.4:1

C.5:1

D.10:1

考点:注册土木工程师岩土工程基础知识注册岩土工程师基础考试上午试题
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用现代动画技术制作的电视动画片《喜羊羊与灰太狼》,受到广大观众的喜爱,获得了上海炫动卡通卫视2008年度收视排行的年度特别奖,同名动画电影也取得了高达8500万的票房。这主要说明,为人们提供的文化产品应当[ ]

A.具有较高的经济效益

B.运用先进的技术手段制作

C.满足人们娱乐的需求

D.采取群众喜闻乐见的形式

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先阅读短文,掌握其大意。然后从方框中所给的词中选出恰当的10个,并用其适当形式填空,每个词限用一次。(每小题1分)

something,  write, when, gift, understand, member,          

birthday,  lucky,  easy, like,  different,  secret.            

If your birthday is coming, what presents will your parents buy for you? It's not    小题1:  for Chinese parents to choose a birthday present for their children. Many American parents also have the same problem .But    小题2:   they have got American girl—an American company. It is famous for its beautiful dolls. Though there are many famous dolls in the world. American girl dolls are becoming one of the most popular birthday    小题3:   for girls.

What makes American girl dolls so popular among girls ? The    小题4:   is in her matching (相配的)hair, skin, eye color, clothing and so on. That is to say, there are    小题5:   kinds of dolls for buyers to choose and the dolls look   小题6:  their owners. The company hopes their dolls can make girls   小题7:  that it is OK to be different from others.

The company gives each American girl doll her own name and special background. They also invite writers to    小题8:  books about her. The stories in the books are mainly about different periods of American history. So    小题9:   the girls are playing with their dolls, they can get a lot of fun and they can learn    小题10:  about history, too. "

题型:单项选择题

食用下列食物可能会发生中毒,其中不是由病菌引起的中毒的是(   )

A.苍蝇叮过的鱼

B.腐烂的橘子

C.变酸的馒头

D.发芽的土豆

题型:单项选择题

哥学派有何风格?主要代表人物是谁?代表作有哪些?

题型:单项选择题

日晡热甚,伴有腹胀腹痛,大便秘结者属于()

A.外感热盛

B.阳明潮热

C.湿热潮热

D.阴虚潮热

E.气虚发热

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