皮皮学，免费搜题
登录
搜题
【简答题】
下面的图是超市中用来识别货物和价格的条形码，它就是黑白相间的条纹，当扫描仪照射它时，黑条纹将光______（选填“反射”或“吸收”），白条纹将光______（同上），再通过电脑解码就可以了．
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】According to his r_______, he has worked as a sales for five years.
【简答题】Part Two. Fill in the blanks Passage two Directions: The passage will be played for three times. Please fill in the blanks of No. 1 to 6 according to the passage you hear. When Mr. Xin arrived in Amer...
【单选题】Happiness can be described as a positive mood and a pleasant state of mind. According to recent polls (民意测验) sixty to seventy percent of Americans consider themselves to be moderately happy and one in...
A.
happiness is predictable
B.
a person in an apparently ideal situation must be happy
C.
the rich are likely to be happier than the middle-income group
D.
happiness is not necessarily connected to one's situation in society
【单选题】According to the speech, Hitler had believed that his attack on the U.S.S.R. would:
A.
cause conflicts between the United States and Great Britain.
B.
ignite sympathy from the right wing of the western countries.
C.
make the United States retreat from the war.
D.
lead to a conclusion of the war.
【单选题】According to Jae Kwon, his nuclear battery______.
A.
uses a solid semiconductor
B.
will soon replace the present ones
C.
could be extremely thin
D.
has passed the final test
相关题目：
参考解析：
知识点：
题目纠错 0
发布
