巴斯德研制的人类历史上第一个减毒活疫苗是() A.卡介苗 B.炭疽芽孢杆菌减毒株 C

题型:单项选择题 A型题

问题:

巴斯德研制的人类历史上第一个减毒活疫苗是()

A.卡介苗

B.炭疽芽孢杆菌减毒株

C.脊髓灰质炎减毒疫苗

D.鼠疫减毒活疫苗

E.伤寒减毒活疫苗

考点:预防疾控微生物检验技术细菌及细菌检验综合题细菌及细菌检验综合题题库
题型:单项选择题 A型题

剪断光缆填充绳及填充松套管等应与光缆切口基本平齐,不得超过光缆切口()公分。

题型:单项选择题 A型题

作图题:在∠ABC内找一点P,使它到∠ABC的两边的距离相等,

并且到点A、C的距离也相等.(写出作法,保留作图痕迹)

题型:单项选择题 A型题

阅读理解。

     根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余

选项。

     Choosing the right job is probably one of the most important decisions we have to make in life,

and it is frequently one of the hardest decisions we have to make. One important question that you

might ask yourself is: "How do I get a good job?"    1    .

     There are people who can answer an insignificant advertisement in the local paper and land the

best job in the world; others write to all sorts of places all over the country, and never seem to get

a reply at all. Still others believe that the in person, door-to-door approach is by far the best way to

get a job; and then there are those who, through no active decision of their own, just seem to be in the

right place at the right time.    2    . He used to spend a lot of his free time down by the sea watching

the tall ships, but never thinking that he might one day sail one of them. His father was a farmer, and

being a sailor could never be anything for the boy but an idle dream. One day, on his usual wandering,

he heard the captain of the ship complaining that he could not sail because one member of his crew

was sick. Without stopping to think, the lad(少年)offered to take his place.     3    .

         4    . If the lad had gone home to consider about his decision for a week, he may have missed his

chance. It is one thing to be offered an opportunity; it is another thing to take it and use it well.

     Sometimes we hear stories about people who break all the rules and still seem to land plum jobs

(美差). When you go for a job interview or fill out an application, you are expected to say nice things

about the company to which you are applying.     5    . And within a year this person had become

general manger of the company.

A. This story also illustrates the importance of seizing an opportunity when it presents itself.

B. People find jobs in an infinite number of ways.

C. it's almost impossible to find a good job by answering advertisement in newspapers

D. Take for example the young man who wanted to be a sailor.

E. But there was one person who landed an excellent job by telling the interviewer all the company's faults.

F. He spent the rest of his life happily sailing the ships he had always loved.

G. It is very important to seize an opportunity when it presents itself.

题型:单项选择题 A型题

下列四支试管中,过氧化氢分解的化学反应速率最大的是

试管温度过氧化氢浓度催化剂
A室温(25℃)12%
B水浴加热(50℃)4%
C水浴加热( 50℃)12%
D室温(25℃)4%

A.A

B.B

C.C

D.D

题型:单项选择题 A型题

简述脉宽调制技术的工作原理

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