窄谱UVB的波长为()。 A.532nm B.380nm C.311nm D.180

题型:单项选择题 A1/A2型题

问题:

窄谱UVB的波长为()。

A.532nm

B.380nm

C.311nm

D.180nm

E.370nm

考点:皮肤与性病学主治医师皮肤性病的预防和治疗皮肤性病的预防和治疗题库
题型:单项选择题 A1/A2型题

下列疾病中,不属于传染病的是 [ ]

A.百日咳   

B.乙型脑炎     

C.蛔虫病   

D.冠心病

题型:单项选择题 A1/A2型题

图中ΔABC为一等腰直角棱镜的主截面,今一细束红单色光DE平行于AB面自AC面射入,经AB面反射后从BC面射出,出射光线为FG。光线DE和FG由插针法确定。

(1)试用几何作图法在图中准确画出光在棱镜内光路走向(含辅助线);

(2)在图中标出DE经AC面折射后的折射角r,用r表示玻璃的折射率为n=_______;

(3)若用一细束紫光沿DE照射,则出射光线_______。

A.仍从原出射点射出,出射光线与FG重合

B.仍从原出射点射出,出射光线与FG不重合

C.从原出射点偏上的某一点射出,出射光线与FG平行

D.从原出射点偏下的某一点射出,出射光线与FG平行

题型:单项选择题 A1/A2型题

     The American book " Who Moved My Cheese" has been a best- seller all over the world.   1   .

Now its author Spence Johnson has written a book just for teenagers.

     The book tells us that when facing changes in our lives, like a new school or new friends, don't be

afraid. Instead, use these changes to make a better life.

       2    A school is changing from having two terms to three terms because there are too many

students.

     Several teenagers are talking about this. Most of them are unhappy and worried. But Chris laughs

and tells a story about two mice, two little people and some cheese.  3     Here, cheese means

something important in life, like moving to a new class or getting into college.   4     The mice realize

that they can't change what has happened and have to find more cheese.   5   The little people, however,

can't do this. They are afraid of change so they find no cheese.

     After Chris finishes the story, the friends understand one thing: to get more cheese, move in a new

direction quickly . His friends understand how this can be used in the changes all teenagers face, such

as doing well at school or having good relationships or just feeling good about yourself.

A.It tells a story which happened between mice and people.

B.It teaches people how to face changes in their lives.

C.But they find the cheese is gone.

D.However, some strange things happened in a school.

E.The book gives an example of a change at school.

F.The four are in a maze looking for the cheese.

G.This means finding different dreams

题型:单项选择题 A1/A2型题

安全性差的水泥对大面积混凝土有影响,对砌体没有影响。

题型:单项选择题 A1/A2型题

药品批准文号前注有XF者为

A.西药

B.辅料

C.进口药品

D.新生物制品

E.西药仿制药

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