常用于表述致病菌毒力的指标为A.LD25和ID25B.LD95和ID95C.LD10

题型:单项选择题

问题:

常用于表述致病菌毒力的指标为

A.LD25和ID25
B.LD95和ID95
C.LD100和ID100
D.LD90和ID50
E.LD50和ID50

考点:微生物检验技术(主管技师)微生物检验专业知识微生物检验技术专业知识
题型:单项选择题

已知A,B均为集合U={1,3,5,7,9}的子集,且A∩B={3},(CUB)∩A={9},则A=______.

题型:单项选择题

根据汉语、首字母提示在课文内容语境中写出单词的适当形式

小题1:Only athletes who have reached the a       standard for their event will be           as competitors

小题2:After that ,what happened to the Amber Room r       a mystery.

小题3:After I was p         by an operator who used cards with holes I could “think” logically and p        an answer quicker than any person.

小题4:Her father said that she must marry, so Atlanta made a b      with him.

小题5:Do you think Hippomenes d        to win the race ?

小题6:Make sure that you all get        (同等)turns in talking to the class

小题7:In this way you will become more          (自信)in speaking English.

小题8:At that time it was           (认为)a technological revolution and the start of my “artificial         (智能)”.

小题9:In1936 my real father Alan Turing, wrote a book about how I could be made to work as a “universal machine” to s       any difficult mathematical problem.

小题10:I was able to s      my knowledge with others        (通过)the World Wide Web.

小题11:I developed very slowly and it took       (将近)two hundred years b        I was built as an analytical machine by Charles Babbage.

小题12:In 2003 it was ready for the people of St Petersburg when they         (庆祝)the 300th birthday of their city.

小题13:It was also a treasure d       with gold and jewels, which took the country’s best         (艺术家)about ten years to make.

小题14:The          (设计)of the room was in the fancy style popular in those days.

题型:单项选择题

读下图,当α=23°26′时,分析回答下列问题:(9分)

(1)此时北京时间为__________________。

(2)此时太阳直射点所在的地理位置是_________________

(3)此时,出现的地理现象是(     )

A.北京多风沙

B.地球公转速度逐渐加快

C.墨累——达令盆地正处于牧羊活动的旺季

D.江苏地区昼长与夜长的比值达一年中的最大值(4)将下列国际著名大城市:纽约、伦敦、香港、上海,按当天正午太阳高度从大到小的顺序排列:___________________________________________________。

题型:单项选择题

在人类生态学上,疾病发生的三大要素是()

A.患者、潜在性患者、健康者

B.感受性、传播途径、传染源

C.宿主、环境、致病因子

D.理化因素、生物学因素、社会经济因素

E.遗传、营养、身体锻炼

题型:单项选择题

基坑施工定位位移允许值应为,转角杆、分歧杆顺线路位移值()mm。

A、≤30

B、≤5

C、≤20

D、≤50

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