有机磷农药中毒抑制胆碱酯酶活性的机制是()。 A.与胆碱酯酶分子结合 B.与胆碱酯酶

题型:单项选择题 A1型题

问题:

有机磷农药中毒抑制胆碱酯酶活性的机制是()。

A.与胆碱酯酶分子结合

B.与胆碱酯酶磷酞基结合

C.使胆碱酯酶活性丧失

D.使胆碱酯酶构象改变

E.使胆碱酯酶活性老化

考点:卫生资格考试(中初级)公卫专业实践能力公共卫生主治医师专业实践能力考前冲刺(五)
题型:单项选择题 A1型题

下图中有一人提出行星运动三定律,完善并简化了日心说,因而被科学界称为“天上的立法者”。他是

                         

题型:单项选择题 A1型题

下列条件不能判定△ABC≌△DEF的是(  )

A.AB=DE、AC=DF、BC=EF

B.AB=DE、∠A=∠D、∠B=∠E

C.AB=DE、∠A=∠D、BC=EF

D.∠A=∠D、∠B=∠E、BC=EF

题型:单项选择题 A1型题

根据美国哈佛医学院提出的“脑死亡”概念,不能确诊“脑死亡”的条件是

A.自主运动和自主呼吸消失
B.对外部刺激和内部需求毫无知觉和反应
C.体温低于32.2℃或服用中枢抑制药物者
D.脑电波平直或等电位
E.诱导反射消失

题型:单项选择题 A1型题

Books are not Nadia Konyk's thing. Her mother brings them home from the library, but Nadia rarely shows interest. Instead, like so many other teenagers, Nadia, 15, is addicted to the Internet. She regularly spends at least six hours a day in front of the computer, spending most of her time reading and commenting on stories written by other users. Her mother, Deborah Konyk, would prefer that Nadia read books for a change.

As teenagers' scores on reading tests have declined, some argue that the hours spent surfing the Internet are the enemy of reading—destroying a precious common culture that exists only through the reading of books. Critics have warned that electronic media would destroy reading.

Others say the Internet has created a new kind of reading. The Web inspires a teenager like Nadia, who might otherwise spend most of her leisure time watching television, to read and write. What is different now, some literacy experts say, is that spending time on the Web engages viewers with text.

Web supporters believe that strong readers on the Web may eventually surpass those who rely on books. Reading five Web sites, experts say, can be more enriching than reading one book. "It takes a long time to read a 400-page book," said Spiro. "In a tenth of the time," he said, the Internet allows a reader to "cover a lot more of the topic from different points of view."

Some literacy experts say that reading itself should be redefined. Interpreting videos or pictures, they say, may be as important a skill as analyzing a novel or a poem. "Kids are using sound and images so they have a world of ideas to put together," said Donna Alvermann, a professor of literacy education at the University of Georgia. "Books aren't out of the picture, but they're only one way of experiencing information in the world today."

Next year, the Organization for Economic Cooperation and Development, which gives reading, math and science tests to 15-year-old students in more than 50 countries, will add an electronic reading component(软件). The United States says it will not participate because an additional test would overburden schools.

小题1:Why are books not the thing of Nadia Konyk?

A.She does reading mainly through electronic media.

B.Her mother doesn’t provide her with enough books.

C.She has become addicted to playing games on the web.

D.Like many youngsters, she has lost interest in reading.小题2:How many hours does Nadia spend in front of the computer in a week?

A.Exactly forty-two hours

B.Usually fifty hours

C.More than forty hours

D.At most thirty-six hours小题3:Which of the following statements is correct according to the passage?

A.To search for information on the web engages viewers without text.

B.To explain videos is a technique more important than analyzing a novel.

C.Children using sound and images may lose their interest in movies.

D.People reading well online may surpass those who rely on books.小题4:Why did the US refuse to participate in the tests with an added electronic reading component?       It is because ______.

A.the teachers and students considered it useless

B.such a test would give schools more extra work

C.they thought reading was the only way to get information

D.none of them showed interest in such an additional test

题型:单项选择题 A1型题

在VLAN中,端口交换方式的特点是()。

A.提高管理效率

B.增加有效带宽

C.端口用户组成用户VLAN非常灵活

D.隔离广播风暴

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