试题与答案

放大镜和显微镜都是常用的观察工具。爷爷用放大镜看书,而王磊把书放在显微镜上,什么

题型:选择题

题目:

放大镜和显微镜都是常用的观察工具。爷爷用放大镜看书,而王磊把书放在显微镜上,什么也看不到,这是因为显微镜只能观察[ ]

A.物体表面的材料    

B.透光的材料  

C.固体的材料        

D.液体的材料

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0514/02e52db499d81c3e76a6fa91b6a4c1ff.html

下面是错误答案,用来干扰机器的。

解;∵(x+y)2=x2+2xy+y2=16,(x-y)2=x2-2xy+y2=8∴(x2+2xy+y2)-(x2-2xy+y2)=8   即4xy=8,∴xy=2.故选B.

试题推荐
题型:单项选择题

资料1:北京京铁有限责任公司(110891××××)订购进口一批热拔合金钢无缝锅炉管(属法定检验检疫和自动进口许可管理商品,法定计量单位为千克),委托辽宁抚顺辽抚锅炉厂有限责任公司 (210491××××)制造出口锅炉。载货运输工具于2007年4月10日申报进境,次日辽宁龙信国际货运公司(210298××××)持经营单位登记手册和相关单证向大连大窑湾海关申报货物进口。保险费率3‰。

资料2

请根据以上资料,选择以下栏目的正确选项:

“随附单据”栏:()。

A.A7Y

B.7:×××××××××××××

C.A:×××××××××××××

D.Y:×××××××××××

查看答案
题型:阅读理解

阅读理解。

     Going on a date can be a nightmare for the best of us. But now a pair of 'social X-Ray' glasses

promises to tell you exactly what the other person is thinking-and when you should stop talking.

     The glasses have a built-in camera which monitors the other person's facial expressions and matches

them up with 24 known features which convey emotions. It will then tell the individual via an earpiece and

lights on the glasses what their date is thinking. In a traffic light-style system, a red light means negative,

yellow means they are a bit interested and green means your date is happy. The glasses are under

development at present by researchers at the Massachusetts Institute of Technology's Media Lab.

     They say that wearing them during a conversation with another person is like having an 'extra sense'

that they are bored or losing interest.

     The eyewear was developed for people suffering from autism (孤独症) who have much difficulty

interacting with others, but now the team behind it has seen wider applications. It works thanks to a

camera the size of a grain of rice which is put into the glasses frame and connected via a wire to a small

computer which can be attached to the user's body. The camera monitors how long and how often 24

'feature points' appear on the subject's faces which are then analyzed by software developed by the MIT

team.

     This data is then compared with a bank of expressions and the computer tells the wearer what is

going on via the earpiece and the traffic light system.

     So far the glasses are still a job in progress and have been accurate just 64 per cent of the time, a

figure which is expected to improve with further tests.

1. The passage mainly tells us that _______.

A. going on a date can be a nightmare for the best of us

B. scientists are showing more and more concern to people suffering from autism

C. the glasses will be more and more popular

D. the scientists are working on a new type of glasses to help people going on a date

2. Which of the following is true according to the passage? 

A. The glasses were initially intended for helping people going on a date.

B. The glasses are widely used and have achieved great success.

C. The built-in camera in the glasses is of great importance.

D. People wearing the glasses are sure to have a good date.

3. The underlined word ''interacting'' in Paragraph 4 can be replaced by _______ . 

A. communicating

B. reacting

C. affecting

D. acting

4. Which is right according to Paragraph 2 ?  

A. Red = negativeyellow = neutral        green = positive

B. Red = positiveyellow = neutral        green = negative

C. Red = neutralyellow = positive       green = negative

D. Red = negativeyellow = positive       green = neutral

5. The passage is probably from _______ . 

A. a guide book      

B. an autobiography book         

C. a leaflet          

D. a scientific report

查看答案
微信公众账号搜索答案