问题
单项选择题
在数据库技术中，面向对象数据模型是一种( )。
A．概念模型
B．结构模型
C．物理模型
D．形象模型
答案
参考答案：B
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在数据库技术中，面向对象数据模型是一种( )。
A．概念模型
B．结构模型
C．物理模型
D．形象模型
参考答案：B
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| Once upon a time the colors of the world started to quarrel. Green said, "Clearly I am the most important. I am the sign of life and hope. I was chosen for grass, trees and leaves. Without me, all animals would 1 ." Blue interrupted, "You only think about the 2 , but consider the sky and the sea. 3 the water that is the basis of life and drawn up by the clouds from the deep sea. Without my peace, you would all be 4 ." Yellow chuckled (笑道), "You are all so serious. I bring laughter, fun, and 5 into the world." Orange started next to blow her trumpet, "I am the color of health and strength. I may be 6 , but I am precious for I serve the needs of human life. When I fill the sky 7 , my beauty is so striking that no one gives another 8 to any of you." Red could stand it 9 and he shouted out, "I am the ruler of all of you. I am the color of danger and of bravery. I am willing to 10 truth. I am also the color of passion and of love." Then came Purple and Indigo (深蓝)… The colors went on boasting, each convinced of his or her own 11 . Their quarreling became louder and louder. Suddenly there was a startling flash of bright lightening thunder. Rain started to pour down 12 . The colors crouched (蜷缩) down 13 , drawing close to one another for comfort. In the midst of the clamor (叫嚷), rain began to speak, "You foolish colors, fighting 14 yourselves, each trying to dominate 15 . Don't you know that you were each made for a special purpose, 16 ? Join hands with 17 and come to me." Doing as they were told, the colors 18 and joined hands. They formed a colorful rainbow. From then on, whenever a good rain 19 the world, a rainbow appears in the sky. They remember to 20 one another. | ||||
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