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[单选题]
13.在数据库系统设计中,描述概念模型的主要工具是
A
E-R图
B
U/C矩阵
C
格栅图
D
关系表
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试题答案:
A
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A foreigner’s first impression of the U.S. is likely to be that everyone is in a rush — oftenunder pressure. City people appear always to be hurrying to get where they are going restlessly,seeking attention in a store, and elbowing others as they try to complete their errands (任务).Racing through daytime meals is part of the pace of life in this country.Working time is considered precious. Others in public eating places are waiting for you to finishso that they too can be served and get back to work within the time allowed. Each person hurries tomake room for the next person. If you don’t, waiters will hurry you.You also find drivers will be abrupt and that people will push past you. You will miss smiles,brief conversations, and small courtesies with strangers. Don’t take it personally. This isbecause people value time highly, and they resent someone else “wasting” it beyond a certaincourtesy point.The view of time affects the importance we attach to patience. In the American system of values,patience is not a high priority. Many of us have what might be called “a short fuse.” We begin tomove restlessly about if we feel time is slipping away without some return — be this in terms ofpleasure, work value, or rest. Those coming from lands where time is looked upon differently mayfind this matter of pace to be one of their most difficult adjustments in both business and dailylife.Many newcomers to the States will miss the opening courtesy of a business call, for example, theywill miss the ritual socializing that goes with a welcoming cup of tea or coffee that may betraditional in their own country. They may miss leisurely business chats in a café or coffeehouse.Normally, Americans do not assess their visitors in such relaxed surroundings over prolonged smalltalks. We seek out evidence of past performance rather than evaluate a business colleague throughsocial courtesies. Since we generally assess and probe professionally rather than socially, westart talking business very quickly.
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