一底面半径为R的半圆柱形透明体的折射率为n=3,横截面如图所示,O表示半圆柱形截

题型:问答题

问题:

一底面半径为R的半圆柱形透明体的折射率为n=

3
,横截面如图所示,O表示半圆柱形截面的圆心.一束极窄的光线在横截面内从AOB边上的A点以60°的入射角入射,求:该光线从进入透明体到第一次离开透明体时,共经历的时间(已知真空中的光速为c,arcsin
3
3
=35°
;计算结果用R、n、c表示).

考点:光的折射定律
题型:问答题

阅读下面的《论语》选段,完成5-6题。

  子游问孝。子曰:“今之孝者,是谓能养。至于犬马,皆能有养;不敬,何以别乎?”(《为政》)

  季康子问:“使民敬.忠以劝,如之何?”子曰:“临之以庄则敬,孝慈则忠,举善而教不能则劝。”(《为政》)

  子曰:“居上不宽,为礼不敬,临丧不哀,吾何以观之哉?” (《八佾》)

1.下列对选段内容的理解,不正确的一项是[ ]

A.孝是孔子思想的重要内容。对赡养父母问题,孔子提出了与一般人不同的见解,认为子女仅仅赡养父母,这是不够的。

B.从政者应当对“孝”做出表率,以此去教育百姓,实现治国的理想。

C.从政者在道德上放松要求,造成社会礼崩乐坏,孔子对此感到痛心和悲伤。

D.多做善事,心存善念,老百姓就会感恩,社会风气就会好转。这是孔子提出的救世主张。

2.三则选段都有“敬”字,孔子在“敬”字上表达了哪些思想内容,请做简要说明。

 _________________________________________________________________________________

题型:问答题

About twenty of us had been fortunate enough to receive invitations to a film-studio(影棚)to take part in a crowd-scene. Although our "act" would last only for a short time, we could see quite a number of interesting things.

We all stood at the far end of the studio as workmen prepared the scene, setting up trees at the edge of a winding path. Very soon, bright lights were turned on and the big movie-camera was wheeled into position. The director shouted something to the camera operator and then went to speak to the two famous actors nearby. Since it was hot in the studio, it came as a surprise to us to see one of the actors put on a heavy overcoat and start walking along the path. A big fan began blowing tiny white feathers down on him, and soon the trees were covered in "snow". Two more fans were turned on, and a "strong wind" blew through the trees. The picture looked so real that it made us feel cold.

The next scene was a complete contrast (对比). The way it was filmed was quite unusual. Pictures in front taken on an island in the Pacific were shown on a glass screen (幕). An actor and actress stood of the scene so that they looked as if they were at the water’s edge on an island. By a simple trick like this, palm trees, sandy beaches, and blue, clear skies had been brought into the studio!

Since it was our turn next, we were left wondering what scene would be prepared for us. For a full three minutes in our lives we would be experiencing the excitement of being film "stars"!

小题1:Who is the author?

A.A cameraman.

B.A film director.

C.A crowd-scene actor.

D.A workman for scene setting.小题2:What made the author feel cold?

A.The heavy snowfall.

B.The man-made scene.

C.The low temperature.

D.The film being shown.小题3:What would happen in the "three minutes" mentioned in the last paragraph?

A.A new scene would be filmed.

B.More stars would act in the film.

C.The author would leave the studio.

D.The next scene would be prepared.

题型:问答题

泵的扬程是指单位重量的液体通过泵后()的增加值,也就是泵能把液体提升的高度或增加压力的多少。

A.能量

B.质量

C.数量

D.体积

题型:问答题

当你要说服民众做疾病检查时,最好使用强调获利的策略。

题型:问答题

根据以下案例,回答下列问题:
宋先生有一定的积蓄,在朋友的介绍下买了基金,分别投资了开放式基金20万元,封闭式基金10万元。

若该信托计划的份额全部发放完毕,共募集资金4000万元,那么平均每份投资额为( )万元。

A.10

B.15

C.20

D.30

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