构成比用以表示() A.某事物内部各组成部分所占的比重 B.某现象发生的频率或强度

题型:单项选择题

问题:

构成比用以表示()

A.某事物内部各组成部分所占的比重

B.某现象发生的频率或强度

C.两个有联系的指标之比

D.某现象在时间顺序上的排列

E.事物在一定时期内发展变化的幅度和速度

考点:职业卫生(医学高级)卫生统计学卫生统计学题库
题型:单项选择题

Thomas Edison was a great American inventor. He was born to a poor family in 1847. His mother taught him at home. He often observed things carefully and he made over 1,300 inventions during his life time. He was often said to be the greatest genius(天才) of his age. There are only a few men in all of history, who have changed the lives of other men as much as the inventor of the first useful electric light. But Edison could never be happy only because someone said he was a genius. “There is no such thing as genius,” Edison said. He also said that what people called genius was mostly hard work. But Edison was a dreamer as well as a worker. From his earliest days as a child he wondered about the secrets of nature. Nature, he often said, is full of secrets. He tried to understand them; then, he tried to learn what could usefully be done with them.

Edison enjoyed thinking. He knew that most people will do almost anything instead of the difficult work of thinking, especially if they do not think very often. But he knew, too, that thinking can give men enjoyment and pleasure.

Edison could not understand how anyone could be uninterested in life. As he loved to think, he also loved to work. On the day he became 75 years old, someone asked him what ideas he had about life. “Work, ” he answered back, “discovering the secrets of nature and using them to make men happier.” He said he had enough inventions in his mind to give him another 100 years of work.

小题1:Edison was______________.

A.interested in changing people’s ideas

B.interested in discovering the secrets of nature

C.very much uninterested in nature

D.uninterested in making people happier by discovering the secrets of nature小题2:Which of the following is NOT TRUE according to the passage?

A.Many other people have changed Edison’s life.

B.Edison has changed the lives of many other people.

C.Only a few men in history can change other people’s lives.

D.Edison invented the electric light.小题3:The last sentence in the passage most probably implies(意指)___________.

A.people of his time were ready to give Edison another 100 year’s work

B.Life is too short for Edison to invent more for human beings

C.Edison made 100 inventions in his life

D.Edison was able to live and work for 100 years

题型:单项选择题

患者,男性,25岁,上唇反复肿胀2年,2年前不明原因上唇左侧肿胀,逐渐加重,继而右侧上唇肿胀,无明显不适感,肿胀至今不消退,故来诊。口腔检查:肿胀区唇红黏膜颜色正常,扪诊有垫褥感。

临床诊断应该为()。

A.良性淋巴增生性唇炎

B.慢性非特异性唇炎

C.克罗恩病

D.肉芽肿性唇炎

E.腺性唇炎

题型:单项选择题

BTOB

题型:单项选择题

下列四类网络产品中,哪一类可既具有中继功能,又具有桥接功能?

A.多路复用器

B.多口中继器

C.集线器

D.模块中继器

题型:单项选择题

就色光来讲,三原色指的是()。

更多题库