已知a是一元二次方程x2-4x+1=0的两个实数根中较小的根.(1)求a2-4a

题型:解答题

问题:

已知a是一元二次方程x2-4x+1=0的两个实数根中较小的根.
(1)求a2-4a+2012的值:(2)化简求值
a2-2a+1
-
1
a
考点:一元二次方程的解法一元二次方程的应用
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某同学在做“研究平抛物体的运动”的实验时得到了如图实所示的物体运动轨迹,abc三点的位置在运动轨迹上已经标出(a点不是抛出点), (g="10" m/s2).则:

(1)小球平抛运动的初速度V0=           

(2)开始做平抛运动的位置坐标x=         ,y=           .

题型:解答题

“您希望政府再办哪些实事?”某市政府向社会公开征集群众的意见和建议。献策者,有常年在田间地头耕作的普通农民,也有学识渊博的院士,有10岁的孩童,也有古稀的老人。从政治生活上看,上述事例表明了(  )

①我国公民享有充分的民主权利 ②民主就是公民可以任意自由地表达自己的意愿 ③社会主义民主具有广泛的群众基础 ④公民享有对国家机关及工作人员的监督权

A.①②

B.③④

C.①③

D.②④

题型:解答题

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’s basic understanding of the world around it. This is the infant’s first introduction to the language that shapes perception and elicits emotion.
Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.
Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.
In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

The child’s basic understanding of the world around it is formed ______.

A.at kindergarten

B.in the earliest months

C.by classroom instructors

D.through interaction with parents

题型:解答题

变电设备检修,涉及(),即使监控信息表未发生变化,运维单位也应在工作前向值班监控员汇报。

A.保护定值

B.控制回路

C.信号测量

D.局放试验

题型:解答题

开展最早,规模最大的世界性排球比赛是()

A.世界排球锦标赛

B.世界杯赛

C.奥运会排球赛

D.世界排球联赛

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