在“用双缝干涉测光的波长”实验中(实验装置如图12): ①下列说法哪一个是错误的

题型:实验题

问题:

在“用双缝干涉测光的波长”实验中(实验装置如图12):

①下列说法哪一个是错误的_______。(填选项前的字母)

A.调节光源高度使光束沿遮光筒轴线照在屏中心时,应放上单缝和双缝

B.测量某条干涉亮纹位置时,应使测微目镜分划中心刻线与该亮纹的中心对齐

C.为了减少测量误差,可用测微目镜测出n条亮纹间的距离,求出相邻两条亮纹间距

②测量某亮纹位置时,手轮上的示数如下图,其示数为______mm。

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

阅读理解。

Dear Mary,

     I've been in England for two months now. I hope you don't think I have forgotten you. There have been

so many places to see and so many things to do that I've not had much time to write letters.

      I will soon be starting my studies at King's College. So far I've been learning about England and British

ways of living. I will tell you about London. There are lots of books you can read and lots of pictures you can

look at. I am sure you'll be more interested to know what I think about the life here.

     I find some of the customs (风俗) new and interesting. People here don't shake hands as much as we do in

Europe. During the first few weeks I was often surprised because people didn't put out their hands when I met

them. Men raise their hats to women but not to each other.

                                                                                                                                   Yours,

                                                                                                                                     Gina

根据短文内容,判断正(T)误(F).

(     )1. The writer came London from Europe.

(     )2. The writer will come to England in two months.

(     )3. She has a little time to write letters.

(     )4. She came to England to make a living.

(     )5. Englishmen don't often shake hands with friends when they meet.

题型:实验题

下列哪项检查提示胎盘功能减退

A.胎儿生物物理评分10分

B.妊娠晚期孕妇24小时尿中E3大于15mg

C.数胎动12小时大于10次

D.妊娠足月时孕妇尿中胎盘泌乳素<4mg/L

E.无应激试验阳性

题型:实验题

编结的方法我们主要分为基本结、()、组合结三大类。

A、变化结

B、平结

C、云雀结

D、吉祥结

题型:实验题

下列不是泥石流特性的是()。

A、固体含量高

B、能量大,突发性强

C、历时长

D、对环境破坏严重,往往是不可逆的

题型:实验题

边喷边钻时应加强观察槽面、池面的变化,同时监测有无()气体出现。

A.二氧化碳

B.氢气

C.氮气

D.硫化氢

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