搜题请搜索小程序“爱下问搜题”
问题 问答题

给你一个电池组，一个开关，3个相同的小灯泡和若干导线组成电路．

要求：当开关闭合后，3盏灯同时亮；开关断开，3盏灯同时熄．试试看有几种连接方法并画出电路图．

答案

如图所示

听力题

第二部分：单词拼写: 根据所给首字母或中文写出单词（共10小题；每小题0.5分，满分5分）

1.   Your v___________ is too small; you need to learn more words.

2. The organization needs more v________ to do the work for free.

3. The word “not” are p __________differently in the UK and the USA.

4. The story is written in s__________English, so it’s easy for you to understand.

5. The company is p___________ their new toothbrush by advertising on television.

6. That building is a m________________ to those who were killed in the war.

7. The news on this web is u__________every day; so you can get information about what happens around the world in time.

8.These two nations had been at war__________ (连续不断地) for eight years.

9. It is a pity that so many buildings were ___________(毁坏) in the big fire.

10.We went to a beautiful town and spent an          ___ (难忘的) day.

查看答案
单项选择题

关于X线投照的描述，正确的是

A．胶片的感光效应与毫安秒和管电压的n次方成正比

B．胶片的感光效应与焦片距的平方成反比

C．X线投照中应使X线管焦点、摄影部位和胶片三者中心在同一条直线上

D．X线焦片距越小，放大率越小，影像越清晰

E．心脏摄影为减少放大失真，宜取180～200cm远距离投照
查看答案