胃内滞留片

有关乳酸脱氢酶，不正确的是（）。

A.以心肌、骨骼肌、肾脏含量最丰富

B.红细胞内含量也极为丰富

C.AMI时其增高较CK、CK-MB增高出现早

D.肝脏疾病时其活性也增高

E.对诊断AMI具有较高的灵敏度，但特异性较差

实验室有NH₄HCO₃和NaHSO₃的干燥粉状混合物，某化学兴趣小组测定其中NH₄HCO₃的含量。小组的同学设计用在混合物中加酸的实验方法来测定其中NH₄HCO₃的质量分数。（SO₂与酸性KMnO₄的反应原理：SO₂＋MnO₄^－＋H^＋→SO₄^2－＋Mn^2＋＋H₂O ）    

回答以下问题：

（1）化学小组主要选用了下列药品和仪器进行实验（图中每种仪器装置只选用了一次，铁架台等固定仪器未画出）

请按气流由左向右的方向,仪器连接顺序是（填仪器的接口字母a、b...)   

A→ ____→_____→____→____→ f → g →_____→______          

（2）实验开始，混合物加酸前，A装置需要鼓入空气，作用是_______________；加酸后A装置再次鼓入空气的作用是 _______________。

（3）E 装置的作用是：__________________。    

（4）实验中，若D瓶中溶液褪色，则测定结果可能会偏___________，为了确保实验中D瓶溶液不褪色，若取样品的质量为m g，实验前 E中所装 a mol/L的KMnO₄溶液体积（V）不少于 _____________mL；

（5）若混合物样品质量为13.1 g,充分作用后碱石灰增重4.4 g，则混合物中NH₄HCO₃的质量分数为____________________。

（6）从定量测定的准确性考虑，该套装置还应作进一步的改进是 ____________________。

阅读理解。

     Some people think that as more and more people have televisions in their homes, fewer and fewer people

will buy books and newspapers. Why read an article in the newspaper, when the TV news can bring you the

information in a few minutes and with pictures? Why read the life story of a famous man, when a short

television program can tell you all that you want to know?

     Television has not killed reading, however. Today, newspapers sell in very large numbers. And books of

every kind are sold more than ever before. Books are still a cheap way to get information and enjoyment.

Although some books with hard covers are expensive, many books are printed today as paperbooks (平装本),

which are quite cheap. A paperback collection of short stories, for example, is always cheaper than an evening

at the cinema or the theater, and you can keep a book for ever and read it many times.

     Books are a wonderful provider of knowledge and pleasure and some types of books should be in every

home. Every home should have a good dictionary. A good encyclopedia (百科全书), though expensive, is

useful, too, because you can find information on any subject. Besides, you can have such books as history

books, science textbook, cookbooks, and collections of stories and poems. Then from time to time you can

take a book of poems off your shelves and read the thoughts and feelings of your favorite poets.

1. It can be inferred from the passage that _____.

A. TV programs are a chief provider of knowledge

B. cinemas are the best choice in getting information

C. reading is a cheap way of learning and having fun

D. newspapers are an expensive way to enjoy oneself

2. What does the sentences "Television has not killed reading, however" underlined in the second paragraph

    suggest?

A. People only need reading, though.

B. Reading is still necessary today.

C. Reading is more fun than television.

D. Watching television doesn't help reading.

3. Which of the following is mainly discussed in the last paragraph?

A. Types of books.

B. Kinds of dictionaries.

C. Lists of history books.

D. Collections of stories and poems.

4. What can we learn from the passage?

A. Fewer and fewer people will buy books.

B. A good dictionary should be kept in every home.

C. Books with hard covers sell better than paperbooks.

D. More people like TV programs about famous men.

关于葡萄球菌的致病性，错误的是（）

A.常引起皮肤化脓性感染

B.医务人员带菌率高，是引起医院内交叉感染的重要传染源

C.表皮溶解毒素可引起烫伤样皮肤综合征

D.血浆凝固酶与葡萄球菌感染易于局限化

E.产生的杀白细胞素可引起食物中毒

鱼池中的乌鳢不易清除，何故？