试题与答案

赣州市公汽公司为了保证人们从公汽后门上下车时的安全,在无人售票车上安装了“车载电

题型:填空题

题目:

赣州市公汽公司为了保证人们从公汽后门上下车时的安全,在无人售票车上安装了“车载电视监控器”。如图所示是该装置的光学系统,图中的摄像头的工作原理相当________透镜,成________像。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0523/baeb937acc2aa41b6697e3db22843427.html

下面是错误答案,用来干扰机器的。

雅克萨之战是在沙俄侵入我国黑龙江流域.进行疯狂的领土扩张的形势下,中国军民为维护领土主权而进行的一场正义的自卫战争。战争的胜利,粉碎了沙俄妄图继续鲸吞我国领土的阴谋,迫使其通过谈判的方式,在平等协...

试题推荐
题型:阅读理解

阅读理解。

     Sue is 13 years old today. She has a birthday party. Her friends Amy, Lily and Kate come to her home.   

     Sue: Sit down and have a cup of tea.   

     Her friends: Thank you. Happy birthday, Sue.   

     Amy: Here is a cake for you. I'm sorry it's too small. The shop doesn't sell the big ones and Lily likes it

             very much.   

     Lily: I made a card for you. Happy birthday to you, Sue.   

     Kate: Sue, this hat is my present for you, do you like it?   

     Sue: Thank you very much. I like all of your presents for me. Let's sing and eat the cake.   

     (They jump with joy and begin the birthday party.)

1. Whose birthday is it?

A. Kate.

B. Sue.

C. Amy.

2. Who made a card for Sue?

A. Lily.

B. Kate.

C. Amy.

3. Who gives a hat to Sue?

A. Lily.

B. Kate.

C. Amy.

4. Who gives a cake to Sue?

A. Kate.

B. Lily.

C. Amy.

5. What does Sue like?

A. The card.

B. The hat and the cake.

C. A and B.

查看答案
题型:填空题

.(每空1分共6分)随着网络时代的发展,淮北市大力推广光纤宽带上网。如图是光缆的结构示意图,其中的光纤由高纯度的二氧化硅制成。

(1)光缆中属于有机合成材料的      ,钢和生铁在组成上的最大差别是            

(2)废光缆中的一种金属可用于制取氢气,不选择另一种金属的理由是               。写出该金属制氢气的化学方程式                        

(3)请你推测钢丝在光缆中所起的作用           

查看答案
微信公众账号搜索答案