电气设备着火时,应先将电气设备停用,切断电源后灭火,灭火时禁用()灭火器。A、泡沫式

题型:单项选择题

问题:

电气设备着火时,应先将电气设备停用,切断电源后灭火,灭火时禁用()灭火器。

A、泡沫式;

B、二氧化碳;

C、干式;

D、四氯化碳。

考点:集控值班员考试电气运行电气运行题库
题型:单项选择题

如图,已知抛物线与x轴交于点A(-2,0),B(4,0),与y轴交于点C(0,8).

(1)求抛物线的解析式及其顶点D的坐标;

(2)设直线CD交x轴于点E.在线段OB的垂直平分线上是否存在点P,使得点P到直线CD的距离等于点P到原点O的距离?如果存在,求出点P的坐标;如果不存在,请说明理由;

(3)过点B作x轴的垂线,交直线CD于点F,将抛物线沿其对称轴平移,使抛物线与线段EF总有公共点.试探究:抛物线向上最多可平移多少个单位长度?向下最多可平移多少个单位长度?

题型:单项选择题

诊断肠旋转不良最可靠的方法是()

A.腹部立位平片

B.B超

C.CT

D.钡餐造影

E.钡剂灌肠

题型:单项选择题

The evidence for harmony ( 和谐)may not be obvious in some families. But it seems that four out of five young people now get on with their parents, which is the opposite of the popularly-held image(形象) of unhappy teenagers locked in their room after endless family quarrels.

An important new study into teenage attitudes surprisingly shows that their family life is more harmonious than it has ever been in the past. "We were surprised by just how positive today's young people seem to be about their families," said one member of the research team. "They're expected to be rebellious(叛逆的) and selfish but actually they have other things on their minds; they want a car and material goods, and they worry about whether school is serving them well. There's more negotiation(商议) and discussion between parents and children, and children expect to take part in the family decision-making process. They don't want to rock the boat."

So it seems that this generation of parents is much more likely than parents of 30 years ago to treat their children as friends. "My parents are happy to discuss things with me and willing to listen to me," says 17-years-old Daniel Lazall. " I always tell them when I'm going out clubbing. As long as they know what I'm doing, they're fine with it." Susan Crome, who is now 21, agrees. "Looking back on the last 10 years, there was a lot of what you could call negotiation. For example, as long as I'd done all my homework, I could go out on a Saturday night. But I think my grandparents were a lot stricter with my parents than that."

Maybe this positive view of family life should not be unexpected. It is possible that the idea of teenage rebellion is not rooted in real facts. A researcher comments, "Our surprise that teenagers say they get along well with their parents comes because of a brief period in our social history when teenagers were regarded as different beings. But that idea of rebelling and breaking away from their parents really only happened during that one time in the 1960s when everyone rebelled. The normal situation throughout history has been a smooth change from helping out with the family business to taking it over."

小题1:According to the author, teenage rebellion ________.

A.resulted from changes in families

B.is common nowadays

C.may be a false belief

D.existed only in the 1960s小题2:What is the passage mainly about?

A.Education in family

B.Harmony in family

C.Teenage trouble in family

D.Negotiation in family小题3:The study shows that teenagers don't want to ________.

A.go boating with their family

B.share family responsibility

C.make family decisions

D.cause trouble in their families小题4:Compared with parents of 30 years ago, today's parents ________.

A.care less about their children's life

B.go to clubs more often with their children

C.give their children more freedom

D.are much stricter with their children

题型:单项选择题

将1元存入银行,按利息率10%复利计息,来计算8年后的本利和的系数是()。

A.年金终值系数

B.复利现值系数

C.复利终值系数

D.年金现值系数

题型:单项选择题

如果触电者伤势较重,已失去知觉,但心脏跳动和呼吸仍然存在,是否立即注射强心针?你认为应该怎样处置?

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