颗粒材料的密度ρ、表观密度ρo。与堆积密度ρ′o之间，下列关系中何者是正确的( ) A: ρo＞ρ＞ρ′o B: ρ＞ρo＞ρ′o C: ρ′o＞ρo＞ρ D: ρ＞ρ′o＞ρo

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以下关于O的运算规则中错误的是(). A: O(f)+O(g)=O(f+g) B: O(f)*O(g)=O(f*g) C: O(Cf) =O(f),其中C是一个正常数 D: O(f)*O(g)=O(max(f,g))