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[单选题]
10．一名顾客可以购买多种商品，一种商品可被多名顾客购买，顾客与商品实体集之间的联系类型是
A
A．一对一 B．一对多 C．多对多 D．无法确定
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C
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27.对行政机关委托的组织作出的行政行为不服，应向下列哪个机关申请复议?【 】
2.
29.领导者表扬下属的艺术要点有
3.
BLast fall was a first-of-its-kind season. I did not arrange (安排) any after-school classes formy children. No swimming.'No music lessons. No play dates. Nothing.Once they finished their homework, they were free to do what they pleased, but only onehour of TV. In the beginning, my sons, Ben, 11, and Nick, 9, were anxious about this sudden,unplanned freedom. I had to, push them out of the door with a ball, a bike, and so on. "Play? Iordered.I learned that this new plan takes time, patience and a lot of faith in the theory that havingexcellent grades isn't really important.When my older kids, now in college and high school, were young, I brought in the rules ofmodern parenting. They are unspoken, but followed carefully. First, you must let your childhave a variety of activities. After all, you never know where you'll find a genius (天才). Second, if the child shows the slightest talent (才能), the activity must be pushed with lessons, special coaching (辅导) and practice of several days a week. Every minute shouldbe taken and every minute has a purpose. That was really too much for my children.Now with the new plan, we told stories, We listened to music. And' the. kids played with bikes, balls, and whatever was handy. Nobody kept score. In fact, the boys played outside so much that the lawn was worn down to the soil in places. They've made friends with those who come from all over the neighbourhood to play games.We like those peaceful evenings. Ben and Nick have a good time this fall, MaYbe that's because the time offhas allowed us to enjoy each other's company;
4.
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在软件开发中，软件系统模型大体上可分为两类：概念模型和( )。
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