题目内容

下列哪个约束不可以为空？()
A 主键
B外键
C默认值
D UNIQUE约束

查看答案

搜索结果不匹配？点我反馈

更多问题

昆明长水机场是目前世界上最大的单体基底隔震建筑。()

表在数据库中是一个非常重要的数据对象，它是用来()各种数据内容的，数据库创建后就可以创建表了，创建表可以用()等方法来创建。
⑴ A、显示 B、查询 C、存放 D、检索
⑵ A、企业管理器 B、查询分析器 C、OSQL D、企业管理器和CREATE TABLE语句

For this part, you are allowed 30 minutes to write a short essay "An Outing". You should write at least 120 words following the outline given below.
你们班级组织了一次春游活动，请根据以下要求就这次春游活动的情况作一简要的描述：
1．此次春游活动你们班级作了哪些准备工作；
2．这次春游的行程及活动情况介绍；
3．这次春游活动给你带来了什么收获。

Advocates of the Coca-colonization thesis identify culture with the consumption of material goods. 62. The heart of a culture, however, involves language, religion, values, traditions, and customs. Drinking Coca-Cola does not make Russians think like Americans any more than eating sushi makes Americans think like Japanese. Throughout human history, fads and material goods have spread from one society to another without significantly altering the basic culture of the recipient society.Enthusiasms for various items of Chinese, Hindu, and other cultures have periodically swept the Western world, with no discernible lasting spillover. The argument that the spread of pop culture and consumer goods around the world represents the triumph of Western civilization depreciates the strength of other cultures while trivializing Western culture by identifying it with fatty foods, faded pants, and fizzy drinks. The essence of Western culture is the Magna Carta, not the Magna Mac.
The modernization argument is intellectually more serious than the Coca-colonization thesis, but equally flawed. 63. The tremendous expansion of scientific and engineering knowledge that occurred in the nineteenth century allowed humans to control and shape their environment in unprecedented ways. Modernization involves industrialization; urbanization; increasing levels of literacy, education, wealth, and social mobilization; and more complex and diverse occupational structures. It is a revolutionary process comparable to the shift from primitive to civilized societies that began in the valleys of the Tigris and Euphrates, the Nile, and the Indus about 5 000 B. C. 64.The attitudes, values, knowledge, and culture of people in a modern society differ greatly from those in a traditional society. As the first civilization to modernizer the West is the first to have fully acquired the culture of modernity. As other societies take on similar patterns of education, work, wealth, and class structure, the modernization argument runs, this Western culture will become the universal culture of the world.
(61)