某地区在一周内进行了高血压普查,可计算当地高血压的()。 A.罹患率 B.发病率 C

题型:单项选择题 A1/A2型题

问题:

某地区在一周内进行了高血压普查,可计算当地高血压的()。

A.罹患率

B.发病率

C.患病率

D.病死率

E.续发率

考点:基础知识流行病学方法流行病学方法题库
题型:单项选择题 A1/A2型题

阅读理解。

     One day Tom and Bill went out for a walk. On the road they saw a lot of people and went up and

had a look. Oh dear! There was a cow in the middle of the road. It would not move. Ten cars and buses

could not get past. Then a policeman came. "Whose cow is this?" he asked. "It's mine." said a farmer,

"But I can't move it." The policeman and the farmer did their best to move the cow, but it would not move.

Tom and Bill laughed, but the drivers of cars and buses were worried. "We can't move the cow." the farmer

and the policeman said, "What shall we do?"

     "Give him a cabbage!" Tom said. "That's a good idea!" said the farmer. Soon he found a cabbage and

showed it to the cow. When the cow saw the cabbage, it walked after the farmer at once. All the cars and

buses could get past at last.

1. Tom went out for a walk _____.

A. with a group of people

B. with Bill

C. all by himself

2. The cow was _____.

A. on the way to work

B. in the middle of the road

C. pleased to see so many people

3. Tom and Bill _____.

A. helped to move away the cow

B. waited for the cars to get first

C. went up and saw a cow in the middle of the road

4. _____ thought a good idea to move away the cow.

A. Tom and Bill

B. The drivers

C. Tom

5. The cow wouldn't move itself because _____.

A. it was hungry

B. it wanted to get on one of the buses

C. so many people were watching it

题型:单项选择题 A1/A2型题

在美国期间,钱学森仅仅为r解决一道薄壳变形的难题,研究的手稿就累积了厚厚一大摞,在工作进展到五百多页部分,他的自我感觉是:“小满意!!!”直到八百多页时,才长舒一口气。他把于稿装进牛皮纸信封,在外面标明“最后定稿”,继而觉得不妥,又在旁边添上一句:“在科学上没有最后!”这表明[ ]

A.追求真理是一个永无止境的过程

B.实践是客观物质性的活动

C.造客观世界与改造主观世界的统一

D.事物的发展是前进性和曲折性的统一

题型:单项选择题 A1/A2型题

如图所示,在一底边长为2a,θ=30°的等腰三角形区域内(D在底边中点),有垂直纸面向外的匀强磁场.现有一质量为m,电量为q的带正电粒子从静止开始经过电势差为U的电场加速后,从D点垂直于EF进入磁场,不计重力和与空气阻力的影响.

(1)若粒子恰好垂直于EC边射出磁场,求磁场的磁感应强度B为多少?

(2)改变磁感应强度的大小,粒子进入磁场偏转后能打到ED板,求粒子从进入磁场到第一次打到ED板的最长时间是多少?

(3)改变磁感应强度的大小,可以再延长粒子在磁场中的运动时间,求粒子在磁场中运动的极限时间.(不计粒子与ED板碰撞的作用时间.设粒子与ED板碰撞前后,电量保持不变并以相同的速率反弹)窗体顶端

题型:单项选择题 A1/A2型题

初级导游员:获导游资格证书半年后,从技能、业绩多方面对其进行考核,合格者即成为初级导游员

题型:单项选择题 A1/A2型题

《中华人民共和国母婴保护法》第六章是()

A.法律责任

B.行政管理

C.技术鉴定

D.附则

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