问题
填空题
Visual ForPro数据库系统所使用的数据的逻辑结构是【11】 。
答案
参考答案：关系（或二维表）
搜题请搜索小程序“爱下问搜题”
Visual ForPro数据库系统所使用的数据的逻辑结构是【11】 。
参考答案：关系（或二维表）
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| Big schoolbags have been a serious problem for students for a long time. Maybe your schoolbag is too 1 to carry, and it troubles you a lot 2 you want to find a book out to read. Now an e-textbook will 3 you. It is said that e-textbooks are going to be 4 in Chinese middle schools. An e-textbook, in fact, is a small 5 for students. It is much 6 than a usual schoolbag and easy to carry. Though it is as small as a book, it can 7 all the materials (材料) for study. The students can read the text page by page on the 8 , take notes with the pointer (屏写笔), or even " 9 " their homework to their teachers by sending e-mails. All they have to do is to press a button. Some people say e-textbooks are good, but some say they may be 10 for the students' eyes. What do you think of it? | ||||
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