双缝干涉实验中,用单色光进行实验时,在毛玻璃屏上可以看到明暗相间的干涉条纹,回答

题型:实验题

问题:

双缝干涉实验中,用单色光进行实验时,在毛玻璃屏上可以看到明暗相间的干涉条纹,回答以下问题

(1)毛玻璃屏上的干涉条纹与双缝垂直还是平行?___________;如果把单缝向双缝移近一些,相邻两亮条纹中心的距离____________.(填“增大”、“不变”或“减小”)

(2)在某次实验中,双缝间距d=0.5mm,双缝与光屏间距离L=0.5m,用某种单色光照射双缝得到干涉图样如图,分划板在图中A、B位置时游标卡尺读数如图, A位置的游标卡尺读数为11.1mm(未画出) ,则B位置的游标卡尺读数为        ,单色光的波长为         m.

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:实验题

下列不能反映下图给我们的启示的是

A.国 * * 障公民受教育权利的实现

B.我们青少年要珍惜受教育权利,努力学习

C.教育公平能促进社会稳定发展

D.教育公平了,社会就公平了。

题型:实验题

隧道防水混凝土抗渗标号以每组试件中有( )个未发现渗水现象时的最大水压力表示。

A.3
B.4
C.5
D.6

题型:实验题

Part 4


Questions 26-45


·Read the following text and decide which answer bestfits each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.

Newspapers


Who won the World Cup 1994 football game What happened at the United Nations How did the critics like the new play When an event takes place, newspapers are on the streets (26) the details. (27) anything happens in the world, reporters are on the spot to (28) the news.
Newspapers have one basic (29) to get the news as quickly as possible from its source, from those who make it to those who want to (30) it. Radio, telegraph, television, and (31) inventions brought competition for newspapers. So did the development of magazines and other means of communication. (32) this competition merely spurred the newspapers on. They quickly made (33) of the newer and faster means of communication to improve the speed and (34) the efficiency of their own operations. Today more newspapers are printed and read than ever before.
Competition also led-newspapers to branch out into many other fields. Besides keeping readers (35) of the latest news, today’s newspapers (36) readers about politics and other important and serious matters. Newspapers influence readers’ economic choices (37) advertising. Most newspapers depend on advertising for their very (38) Newspapers are sold at a price that (39) to cover even a small fraction of the cost of production. The main (40) of income for most newspapers is commercial advertising. The (41) in selling advertising depends on a newspaper’s value to advertisers. This is measured (42) circulation. How many people read the newspaper Circulation depends (43) on the work of the circulation department and on the services or entertainment (44) in a newspaper’s pages. But for the most part, circulation depends on a newspaper’s value to readers as a source of information (45) the community, city, country, state, nation, and world—and even outer space.

A.Wherever

B.Whoever

C.Whatever

D.Whichever

题型:实验题

法人财产权从法律意义上回答了资产归属问题,同时,从经济意义上回答了资产的经营问题。()

题型:实验题

()应当至少对滑行道、机坪、升降带、跑道端安全地区、飞行区围界、巡场路巡视检查一次。

A.每6小时

B.每12小时

C.每日

D.每两日

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