這些變量是用數據描述(定義)的吧?!
回答: ★ 從宏觀的意義上說,當用係統方程來解決社會問題時,不需要參照物,隻需要變量。係統方程裏的所有變量,浩如煙海,它們不是作為參照物
由 star-sun
於 2013-04-05 19:30:38
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