传染病流行过程的基本条件A.散发、流行、暴发流行 B.病原体、人体、外环境 C.自然

题型:单项选择题

问题:

传染病流行过程的基本条件

A.散发、流行、暴发流行

B.病原体、人体、外环境

C.自然因素、社会因素

D.传染源、传播途径、易感人群

E.患者、病原携带者、受感染的动物

考点:中医执业助理医师中医执业助理医师
题型:单项选择题

司可巴比妥钠(分子量为260.27)采用溴量法测定含量时,每1ml溴滴定液(0.1mol/L)相当于司可巴比妥钠的毫克(mg)数为( )。

A.1.301
B.2.601 C.13.01
D.26.01
E.18.01

题型:单项选择题

编制概算定额的基础是()。

A.施工定额

B.劳动定额

C.预算定额

D.概算指标

题型:单项选择题

刘某某,男,50岁,农民。因脑瘤术后3周入院,患者于半年前出现头痛头昏,呈进行性加重,行头颅CT检查:脑表面见一约3cm×3cm的稍高密度影,边界清,与颅骨相贴,内见散在钙化点,脑实质受压,周边轻度水肿,增强扫描呈明显强化,考虑脑膜瘤,于三周前行颅内肿瘤切除术,术后病理:恶性脑膜瘤。

诊断和诊断依据是什么?

题型:单项选择题

阅读理解。

     Many children act in TV shows. They work several hours every day, so they cannot go to a regular

school. How do they get an education?

     In Hollywood, where many TV shows are made, about forty teachers give lessons for the children in

the shows. They teach wherever their pupils are working.

     They teacher's job is very important. She is responsible for making sure that the child works only the

permitted hours each week. She is also responsible for making sure that the child learns the required

subjects. She makes sure, too, that the child gets enough rest and play, along with his education.

     Child actors are required to attend classes twenty hours each week. California law says that they must

be taught from September to the middle of June. If they do not get good marks in school, they are not

permitted to continue working in TV shows.

     TV children are usually good pupils, and most of their teachers like this special kind of work. Their

classes are held in many interesting places. Sometimes the "classroom" is a Mississippi riverboat. Sometimes

it is the inside of a spaceship. Often the pupils become famous stars.

1. Which of the following statements expresses one of the main ideas given in this selection?

A. We must realize that television is the most powerful force in the education of children today.

B. Unfortunately children who act in TV shows cannot be educated because their work does not permit

    them to attend school.

C. Special arrangements are made for giving a good education to children during the weeks of their

    employment as TV actors.

D. Most of the teachers like their work.

2. Where are most TV shows made?

A. In Washington D.C.

B. In Mississippi

C. In New York

D. In California

3. What information about TV teachers does this selection provide?

A. Some of them are paid twice as much as the teachers in regular schools.

B. Most of them enjoy their work.

C. Many of them hope to become TV actors and actresses.

D. Few of them come from foreign countries.

4. A child is not permitted to continue in a TV show _____.

A. if his teacher says that his school work is unsatisfactory

B. if his work takes him to places like spaceships and riverboats, where there are no classrooms

C. if he is working during the winter months (September to June)

D. if he is absent from class more than once

题型:单项选择题

青枯病是马铃薯生产中一种危害严重的细菌性病害。1996年,我国科学家首次在世界上获得抗青枯病转基因马铃薯株系,为防治这种毁灭性病害开辟了道路。他们根据存在于昆虫体内的抗菌肽的氨基酸序列,人工设计并合成了几个抗菌肽基因,例如ShivaA,CecropinB等基因,并将其导入马铃薯中,转基因马铃薯获得了青枯病抗性的表型。

在克隆基因过程中,通常采用() 技术对目的基因进行扩增,下列由一个DNA分子扩增为两个DNA分子过程的叙述中,正确的序号顺序是() 。

①引物与单链相应互补序列结合

②目的基因DNA受热变性后解链为单链  

③DNA聚合酶作用下复制

更多题库