问题 实验题

(9分)下图为显微镜结构示意图,请据图回答有关问题(括号内填序号,横线上填文字)

(1)显微镜下观察到的物像是_______的(填“正立”或“倒立”)。如果在载玻片上写有字母“p”,在显微镜的视野中看到的物象是____

(2)对光时,转动转换器,要用_______(填高倍或低倍)物镜对准通光孔. 用来调节光线强弱的结构是.遮光器和[    ]       

(3)观察时左眼注视目镜内,右眼应______。

(4)把要观察的玻片标本放在载物台,标本要正对通光孔中央。先转动时的结构是[  ] 粗准焦螺旋,再略微转动的结构是[    ]      。直到看到的物象清晰为止.

(5) 某物像在显微镜视野的右上方,要使该物像移至视野正中央,移动玻片标本的方向是( )

(6)如果镜头太脏,必须使用                                     来擦试。

答案

(1)倒立   d   (2)低倍    [8]反光镜     (3)同时睁开

(4)[2]  [3]    细准焦螺旋    (5)右上方    (6)擦镜纸

:(1)由于显微镜下观察到的物像是倒立的,如果在载玻片上写有字母“p”,在显微镜的视野中看到的物象是实物的倒像d.

(2)对光时,转动转换器,要先用低倍物镜对准通光孔.用来调节光线强弱的结构是遮光器和反光镜,凹面反光镜汇聚光线亮度增强,平面镜不能改变亮度;遮光器的大光圈通过的光线多,亮度强,小光圈通过的光线少亮度暗;(3)观察标本时,左眼注视目镜内,右眼必须同时睁开,这是初学者易犯的错误;

(4)观察玻片标本时,先转动粗准焦螺旋,找到物象,换上高倍物镜后,放大倍数增大,焦距改变,物像模糊不清,应该调节3细准焦螺旋,使物像更加清晰.

(5)因为在显微镜下所成的像是实物的倒像,因此物像的移动方向与玻片的移动方向相反,视野右上方的物象调到视野的正中央,物像向左下方移动,因此玻片向右上方移动

(6)如果镜头太脏,必须使用专门的擦镜纸,以免损坏镜头

故答案为:

阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Over the last 25 years, British society has changed a great deal-or at least many parts of it have. 1_____.

Ideas about social class-whether a person is "working-class"or "middle-class"-are one area in which changes

have been extremely slow.

     In the past, the working-class terlded to be paid less than middle-class people. The typical working man

would collect his wages on Friday evening and then, as was widely believed, having given his wife her

"housekeeping",would go out and spend the rest on beer and betting.

     The old style of what a middle-class man did with his money was perhaps nearer the truth. He was likely

to take a longer-term view. Not only did he regard buying a house as a most important thing, but he also

considered the education of his children as extremely important. 2_____. Only in very few cases did workers

have the opportunity to make such long-ten plans. 

     3_____. In a large number of cases factory workers earn as much as their middle-class supervisors (管理

者). Social security and laws to improve job-security have made it less necessary than before to worry about

"tomorrow". Working-class people seem slowly to be losing the feeling of inferiority (自卑感). In fact there

has been a growing tendency in the past few yars for the middle-classes to feel slightly ashamed of their

position.

     4_____. They generally tend to share very similar tastes in music and clothes, they spend their money in

having a good time, and save for holidays or longer-term plans when necessary. There seems to be much less

difference than in previous generations. 5_____. As long as this gap exists, there will always be a possibility

that new conflicts will appear, or rather that the old conflicts will reappear, but between different groups.

A. Nowadays, a great deal has changed

B. Both of these provided him and his family with security

C. As a result, differences in life-styles and attitudes came into existence

D. However, we still have a wide gap between the well-paid and the low-paid

E. In recent years, the working-class people have begun to design long-tem plans

F. In some ways, however, very little has changed,particularly where attitudes are concerned

G. The changes in both lifehstyles and attitudes are probably most easily seen amongst younger people

多项选择题