这些变量是用数据描述(定义)的吧?!
回答: ★ 从宏观的意义上说,当用系统方程来解决社会问题时,不需要参照物,只需要变量。系统方程里的所有变量,浩如烟海,它们不是作为参照物
由 star-sun
于 2013-04-05 19:30:38
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