为了测定光在透明的有机玻璃中的传播速度,一同学采用先测出其折射率再计算光速的方法

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问题:

为了测定光在透明的有机玻璃中的传播速度,一同学采用先测出其折射率再计算光速的方法。他先用插针法完成光路图后,却发现没有量角器,他用了如图10所示的方法,以P1 P2连线与有机玻璃砖的交点O为圆心,以10.0cm为半径作圆,分别交P1 P2连线于A点,交OO´连线的延长线于B,并分别过A、B两点向界面的法线NN´作垂线。用直尺量得的数据如图(单位:mm),则此有机玻璃的折射率为  __________ ,光在该有机玻璃中的速度为  ___________ m/s 。(已知光在真空中的速度为3.0×108m/s)

考点:实验:用双缝干涉测量光的波长实验:测定玻璃的折射率
题型:填空题

You can't _____ it in English like that.   [ ]

A. speak

B. say

C. talk

D. tell

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从“东方红”人造卫星发射成功,到“神舟五号”载人归来,再到 “天宫一号”与“神舟八号”辉煌对接,中国的科技发展在不到半个世纪里成就举世瞩目。

根据材料,结合所学知识回答下列问题:

(1)上述材料体现了我国怎样的科技现状?

________________________________________________________________________________

(2)科学技术对我国的发展有什么重大作用?

________________________________________________________________________________

(3)请说出几种提高自身科学文化素质的具体做法。

________________________________________________________________________________

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以下关于正常肾脏声像图错误的是

A.肾皮质回声略高于肾髓质,但低于肝和脾的实质回声

B.肾窦回声与腹膜后大血管周围脂肪组织的回声强度相仿

C.肾锥体呈圆锥形结构放射形排列在肾窦周围

D.彩色多普勒可显示肾皮质与肾髓质交界处的弓状动脉

E.彩色多普勒于肾内显示5支段动脉,即上极支、下极支、前上支、前下支和小叶支

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有如下事件过程: Private Sub Form_KeyDown(KeyCode As Integer,Shift As Integer)   If(Button And 3)=3 Then     Print"OK"   End If End Sub 程序运行后,为了在窗体上输出"OK",应当按下的鼠标键是

A.左键

B.右键

C.同时按下左键和右键

D.按什么都不显示

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It’s generally been said that history is written by the winners. This was never more true than on March 12, when the Texas board of education voted 10-5 in favour of curriculum standards that would promote conservative takes on controversial issues in the pages of the state’s textbooks. The changes, expected to win final approval in May, include an increased emphasis on and sympathetic treatment of such Republican standards as the National Rifle Association and the Moral Majority. They also boast the advantage of capitalism and the role of Christianity in the nation’s founding. Even Thomas Jefferson’s profile will be reduced; some board members were less than fond of his ideas about the division of church and state.

This is not Texas’ first such skirmish. Since the 1970s, the state has tried to drop books that were seen as too liberal or anti-Christian, to omit passages on the gay-rights movement and to tone down global-warming arguments. But the nation’s battle over textbooks stretches back almost half a century earlier. In 1925, Tennessee’s Butler Act (which was abolished in 1967) made it illegal to teach " any theory that denies the story of the Divine Creation of man as taught in the Bible. " The Scopes " monkey trial" famously followed. In 1974, a clash erupted in Kanawba County, West Virginia, over the controversial writings of such authors as George or well, Arthur Miller and Allen Ginsberg, Opposition was so heated that some schools were firebombed.

As one of America’s largest textbook buyers, the Longhorn State has a good deal of sway over what is sold to schools nationwide. And while Napoleon may have maintained that " history is the version of past events that people have decided to agree upon, " getting Texans to come together on the past may prove to be their Waterloo.

Which of the following is true according to the second paragraph()

A. The Texans hold a favourable attitude towards religion

B. The Texans are sympathetic with the gay-rights movement

C. It was illegal to teach religion in Tennessean schools in 1920s

D. George Orwell was widely hailed by West Virginians in 1970s

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