把一根长20cm的圆柱木料锯成三段,每段仍是圆柱,表面积比原来增加了0.25cm

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问题:

把一根长20cm的圆柱木料锯成三段,每段仍是圆柱,表面积比原来增加了0.25cm2,这根圆柱木料原来的体积是(    ) cm3

考点:圆柱的体积
题型:填空题

Education is one of the key words of our time. A man, without an education, many of us believe, is an unfortunate victim of unfortunate circumstances deprived of one of the greatest twentieth-century opportunities. Convinced of the importance of education, modern states "invest" in institutions of learning to get back "interest" in the form of a large group of enlightened young men and women who are potential leaders. Education, with its cycles of instruction so carefully worked out, is punctuated by textbooks--those purchasable wells of wisdom--what would civilization be like without its benefits

So much is certain: that we would have doctors and preachers, lawyers and defendants, marriages and births; but our spiritual outlook would be different. We would lay less stress on "facts and figures" and more on a good memory, on applied psychology, and on the capacity of a man to get along with his fellow-citizens. If our educational system were fashioned after its bookless past we would have the most democratic form of "college" imaginable. Among the people whom we like to call savages all knowledge inherited by tradition is shared by all; it is taught to every member of the tribe so that in this respect everybody is equally equipped for life.

It is the ideal condition of the "equal start" which only our most progressive forms of modern education try to reach again. In primitive cultures the obligation to seek and to receive the traditional instruction is binding on all. There are no "illiterates"--if the term can be applied to peoples without a script--while our own compulsory school attendance became law in Germany in 1642, in France in 1806, and in England 1976, and is still non-existent in a number of "civilized" nations. This shows how long it was before we considered it necessary to make sure that all our children could share in the knowledge accumulated by the "happy few" during the past centuries. Education in the wilderness is not a matter of monetary means. All are entitled to an equal start. There is none of the hurry that, in our society, often hampers the full development of a growing personality. There, a child grows up under the ever-present attention of his parents; therefore the jungles and the savages know of no "juvenile delinquency". No necessity of making a living away from home results in neglect of children, and no father is confronted with his inability to "buy" an education for his child.

Notes: juvenile delinquency 青少年犯罪。

It can be inferred from the text that()

A. some families now can hardly afford to send their children to school

B. everyone today has an equal opportunity in education

C. every country invests heavily in education

D. we are not very certain whether preachers are necessary or not

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引起人类结核病的最主要的致病菌是()

A.人型结核杆菌

B.牛型结核杆菌

C.非洲型结核杆菌

D.鼠型结核杆菌

E.非结核分枝杆菌

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内部业务工作单产生的单据包括有()。

A.用电检查工作单

B.用电检查结果通知书

C.客户电气事故索赔单

D.营销业务工作单

题型:填空题

关于喉的正确叙述是()。

A.喉肌是平滑肌

B.喉软骨都是完整的软骨环

C.声门裂是喉腔最狭窄的部分

D.经喉口通食管

E.是呼吸的通道但不是发音的器官

题型:填空题

* * * * 强调,要在全社会大力弘扬,倡导社会主义基本道德规范,促进社会主义良好社会风气的形成:()

A、爱国主义,集体主义,社会主义思想

B、 * * 主义精神

C、团结互助精神

D、"三个代表"重要思想

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