条形码怎么用二进制表示计算过程 可以举个例子吗,

今在我省中考大部分地区实行网上阅卷，要求每份试卷必须贴上条形码，然后由条形码扫描器扫入电脑进行工作，如下左图所示。条形码扫描器由发光二极管、光敏二极管等元件构成。当发光二极管发出的光照射到条形码上时，光敏二极管便接收到被条形码 回来的光，并将光信号转变为电信号，再输送到电脑获取考生信息。条形码扫描器中的发光二极管和光敏二极管都属于 材料。

如图所示是无锡市2013年中考试卷答题卡中用来识别考生信息的条形码（样码）。当条形码扫描器照射它时，黑条纹将光 （选填“反射”或“吸收”），白条纹将光 （选填“反射”或“吸收”），再通过电脑解码就可以获取考生相关信息。

Barcodes (条形码) aren’t given much thought by the majority of consumers, but these codes were fairly recently applied in a working fashion in 1970.
A small food store owner decided one day that keeping records of the inventory (存货) of his stock and the associated prices were an extremely laborious process, and so, in 1948, he contacted the The Drexel Institute of Technology in a bid to work towards a solution. Bernard Sliver rose to the challenge and set out to study the problem, and began working on a solution involving an automatic way of keeping track of items that had been sold. Silver and a group of students from the institute realized their answer in the form of ultraviolet light (紫外线), ink and a scanner.

The system worked initially, but possessed some negatives. It was incredibly costly to carry out on a large scale and the system was also unstable. If the invention was to become commonplace (寻常的事) in grocery stores, these two problems had to be solved.
The patent (专利)for the bar code system was filed by Sliver and one of his students, Woodland. The patent was not granted immediately; in fact it took three years for the patent agency to grand their invention patent for the barcode, occurring on 7 ^th October, 1952.
Despite the patent being issued, the system was still not welcomed by the majority of store owners. It was not until 1966 that the system began moving its way into more and more grocery stores. This system was soon criticised, as there was no central mechanism for controlling uniformly coded items. In 1970, Logicorn developed the Universal Grocery Products Identification code (UGOIC), soon shortened to Universal Identification Number (UPC). It was Marsh’s superstore, in Troy, which was the very first store to install this complex barcode reading system, and its popularity has soared (升温) ever since, and is obviously now commonplace in all types of stores worldwide.
小题1:What is stressed in the second paragraph?

A．The heavy work of store owners.

B．The function of ultraviolet light, ink and a scanner.

C．The origination of barcodes

D．Bernard Silver’s education background.

小题2:Which of the following was NOT a drawback of Silver’s system?

A．It was expensive to be applied on a large scale.

B．It was a laborious process.

C．The system was not stable.

D．It lacked a central mechanism.

小题3:What is the purpose of the text?

A．To tell people that failure is the mother of success.

B．To praise scientists’ efforts in making people’s lives easier.

C．To describe shop owners’ opinions of barcodes.

D．To provide information about the development of barcodes.

如图所示是济宁市2013年中考试卷答题卡中用来识加别考生信息的条形码（样码）。当条形码扫描器照射它时，黑条纹将光 （选填“反射”或“吸收”），白条纹将光（选填“反射”或“吸收”），再通过电脑解码就可以获取考生相关信息。

第二卷
注意事项：
1答题前，考生先在答题卡上用直径0．5毫米黑色墨水签字笔将自己的姓名、准考
证号填写清楚，然后贴好条形码。请认真核准条形码上的准考证号、姓名和科目；
2第二卷共2页，请用直径0．5毫米黑色墨水签字笔在答题卡上各题的答题区域
内作答，在试题卷上作答无效。
第四部分写作(共两节，满分35分)
第一节短文改错(共l0小题；每小题l分，满分l0分)
(注意：在试题卷上作答无效)
此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该
行右边横线上画一个勾(√)；如有错误(每行只有一个错误)，则按下列情况改正：
此行多一个词：把多余的词用斜线()划掉，在该行右边横线上写出该词，并也用
斜线划掉。
此行缺一个词：在缺词处加一个漏字符号(/)，在该行右边横线上写出该加的词。
此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
It was a chance of a lifetime to win the first 76_______
prize on the Story Writing Show. All I had to do 77_______
was to write a story or present it. My teachers 78_______
have been telling me how great my writing was. 79_______
So if they had said was true, I would have a chance 80_______
of winning the prize. What were better, I had useful 81______
help. There was Uncle Chen, gentleman living 82______
near my house, who was a very much famous writer. 83______
He agreed to reading my story and give me some 84______
advices on how to write like a real writer. 85______