中国大学MOOC: A bar code reader is an input ______ to read the information of bar codes.
                    举一反三
- A bar code reader is an input ______ to read the information of bar codes. A: device B: term C: simulation D: process
 - Which of the following is not a type of scanning device? A: Optical scanner B: Bar code reader C: Stylus D: Character and mark recognition
 - Bar Code指的是商品上的条形码。
 - 中国大学MOOC:"The owner of a bar is called a landlord instead of a manager in the U.S..";
 - 中国大学MOOC: 从代数区将多个对象拖动到指令栏(input bar)可以快速创建一个列表
 
