问题
单项选择题
在E-R图中,用来表示实体的图形是【 】。
A．矩形
B．椭圆形
C．菱形
D．三角形
答案
参考答案：A
解析：在E-R图中,用矩形表示实体集,用椭圆形表示属性,用菱形(内部写上联系名)表示联系。
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在E-R图中,用来表示实体的图形是【 】。
A．矩形
B．椭圆形
C．菱形
D．三角形
参考答案：A
解析：在E-R图中,用矩形表示实体集,用椭圆形表示属性,用菱形(内部写上联系名)表示联系。
Early last year, two young brothers in Jiangsu Province badly burned while playing. The“game”they were playing was they had watched in the cartoon Pleasant Goat and the Big Big Wolf （《喜羊羊和灰太狼》）.The brothers were two little goats while their friend was playing a bad wolf . Their friend tied them a tree and set fire to the grass around them. The sad story is an example of how many children follow the violence（暴力） they see on television, especially cartoons. It is that violent cartoons can make children more aggressive（具有攻击性的）. In a survey, researchers the children after watching non-violent and violent cartoons. They found that the kids who watched violent cartoons fought with others and class rules more often. Children under the age of seven are too to understand that the violence on TV can bring real harm. It is parents’ job them understand it.
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