导线弧垂的大小与导线的允许应力（）。A.成正比 B.成反比 C.相等 D.无关系

儿童，女，因伤寒服用氯霉素，1周后查血象发现有严重贫血和白细胞、血小板减少，这种现象发生的原因是（）

A.氯霉素破坏了红细胞

B.氯霉素缩短了红细胞的寿命

C.氯霉素抑制了线粒体整合酶的活性

D.氯霉素抑制了高尔基体的功能

E.氯霉素加强了吞噬细胞的功能

根据下列资料，回答以下各题。 

注：就业人口占比=就业人口/年满16岁以上的自有公民数

劳动力人口占比=劳动力人口/年满16岁以上的自由公民数 

失业率=失业人口/劳动力人口

关于各年龄段就业人数与失业人数的相关情况，下列说法正确的是（）。

A.从失业、就业两方面看，各年龄段男性人数都多于女性人数 

B.失业率最高的为16~19岁的男性，其失业率为24.1% 

C.就业人口最多的年龄段为45~54岁 

D.失业率最低的未45~54岁的女性

阅读理解。

     How the iron (熨斗) of tomorrow (the first Self Cleaning Iron) can change your lifestyle today?

     General Electric introduces the iron of tomorrow. The iron can clean itself inside where irons get dirty.

Because it cleans itself each and every time you empty it. How? With a push of a magic blue button.

     The magic blue button

     The first thing you'll notice that's different about this iron is the blue button on the side. It's marked "Self

Clean". Push this blue button, and you can wash out loose mineral deposits(沉淀物) that remain and block up

inside. Push this button, and you've made life a lot easier.

     Less chance of brown spots

     Sure, Self Cleaning Iron is going to cut down on brown spots (Those ugly spots that happen on nice,

cleanly pressed clothes.) because a Self Cleaning Iron becomes clean each time you press that magic blue

button.

      Steams better longer

     Common sense tells you that if you've got an iron that blocks less often it has to stay younger for a long

period of time. In other words, it steams better longer. That's another joy of owning General Electric's Self

Cleaning Iron.

     What does it mean to you

     Today you are doing so much more than just running a house and running after the kids. You're working.

 You're going to school. It's all part of you to be a better wife, a hotter mother, a better housemaker, we want

to. The new Self Cleaning Iron is another one of Home-Makers from General Electric.

      Lifestlye.

     We're with yours.

     GENERAL ELECTRIC

1. This passage is ______.

A. an introduction to General Electric

B. an operating instruction of Self Cleaning Iron

C. an advertisement of Self Cleaning Iron

D. a description of the change of lifestyle

2. This iron can clean itself by ______.

A. emptying itself

B. washing out mineral deposits

C. blocking up mineral deposits

D. giving off more steam

3. According to the passage, what is most likely to attract the customers?

A. It is made by General Electric.

B. The iron will not produce mineral deposits.

C. Their clothes will be washed at the same time.

D. There will be fewer brown spots on pressed clothes.

4. Self Cleaning Iron can help change your lifestyle because ______.

A. you can run your house better

B. you don't have to run after the kids

C. you can use it while you are working

D. we want you to stay at home

对于“不得高于”一定标准的风险监管指标，当风险监管指标达到规定标准的80%时，就属于中国证监会设置的预警标准。（）

20/80规则和什么相关（）

A、验收抽样

B、控制图

C、散点图

D、帕累托图