问题 多项选择题

在那些情况下需要对起升高度限位器进行调整()?

A、更换钢丝绳

B、变换钢丝绳倍率

C、顶升加节

D、重新安装

答案

参考答案:A, B, C, D

阅读理解

People who cannot tell all colors apart are said to be color-blind. Most color-blind people can see yellows and blues, but confuse reds with green. It is very rare for a person to be blind to all colors, but they may see everything in shades of black, white and gray.

It is interesting to point out that many color-blind people don’t even realize that they are color-blind, they don’t know that the colors they are seeing and naming are not the actual colors that people with normal vision can see. This can be dangerous when a color-blind person confuses the red and green of a traffic light.

Color blindness is thought to be inherited(遗传)and although doctors have tested color blindness, there is no cure to treatment for it.

小题1:There are four cards here, and each has two colors. Which card’s colors do you think a color-blind person can tell correctly?

A.Red, Green

B.Green, Yellow

C.Red, Brown

D.Brown, Yellow小题2:A color-blind person______.

A.always knows how color-blind he is

B.often gives the wrong name of colors

C.see everything as the same color

D.can hardly see something of strong colors小题3:It’s especially dangerous for a color-blind person to cross a street when_____

A.it is crowded

B.it is a dark night

C.there are no traffic lights at the cross of the streets

D.the traffic light turns red小题4:A person who is color-blind is believed to have something to do with_____.

A.his old age

B.his poor eyesight

C.his parents or grandparents

D.his living condition小题5:Up to now, doctors______.

A.have found a way to prevent a person from getting color-blind

B.have found a way to free a person from his color blindness

C.have been able to tell whether a person is color-blind or not

D.have made it quite clear the cause of color blindness

单项选择题