生物半减期() A.进入体内的毒物,通过代谢,排出体外的时间 B.毒物进入体内,产生

题型:单项选择题 A1型题

问题:

生物半减期()

A.进入体内的毒物,通过代谢,排出体外的时间

B.毒物进入体内,产生有害作用所需的时间

C.进入体内的毒物,通过代谢和排出,在体内浓度减低一半所需要的时间

D.毒物使动物的一半出现某种效应所需时间

E.以上均不是

考点:公卫执业助理医师环境卫生学环境卫生学题库
题型:单项选择题 A1型题

低钾血症最早的临床表现是()

A.肌无力

B.腹泻

C.多尿

D.多汗

E.腱反射亢进

题型:单项选择题 A1型题

“它不是一般意义上的行军,不是战役,也不是胜利。它是一曲人类求生存的凯歌,是为了避开蒋介石的魔爪而进行的一次生死攸关、征途漫漫的撤退,是一场险象环生,危在旦夕的战斗。”这段描述所反映的历史事件是 [ ]

A.井冈山会师

B.红军长征

C.红军反“围剿”战争

D.辛亥革命

题型:单项选择题 A1型题

This was one of my experiences (1) . When I was in my 30s, I was working for a large international company which had its head office in London. I was working in the (2) department.

The company had a training centre which was just outside London. Different courses were held there throughout (3) and I (4) go on one training course a year. These usually started (5) a Sunday evening and lasted six days.

Once I was (6) a week’s training course with about forty (7) sales people. I was in the bar on the Friday evening and suddenly a woman who was (8) behind the bar asked mea curious question. "I hope you don’t (9) my asking," she said, "but I’ve been (10) about it all week. Have you got a sister (11) Mary" The woman’s name was June. And she used to do various jobs at the training centre. She worked in the office, she organized all the food and drink for the centre and she worked in the bar at lunchtime and in the evening.

My answer (12) June’s question was "Yes", and June said, "I thought (13) . I met her last September when she was organizing a course here. " At that time, my sister was working for (14) company but in a different part of the country. That was (15) she came to be at the training centre.

(16) surprised me was how June guessed we were brother and sister. Three things made it even more (17) . First, she had met my sister six months before she met me. Second, they have about sixty new people every week at the training centre. So about one thousand five hundred people had (18) the centre in those six months. And (19) , my sister is married, so she doesn’t have the same family name as me.

We’re not (20) , but I guess we must look quite like each other.

8().

A.hearing

B.waiting

C.serving

D.seeing

题型:单项选择题 A1型题

现场保护装置整定值的调整和更改,应按保护装置整定值()的要求执行。

A.通知单 

B.报告单 

C.报告书

D.校验单

题型:单项选择题 A1型题

据《建设工程工程量清单计价规范》GB50500—2013,发包人要求提前赶工,承包人可以要求增加的赶工费用包括()

A.人工费的增加

B.材料费的增加

C.机械费的增加

D.管理费的增加

E.窝工费的增加

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