命题＂ x _ 0 C _ R Q , x_ 0 ^ 3…——2012 高考数学第 2 题答案解析

2．命题＂$\exists \mathrm{x}_{0} \in \mathrm{C}_{\mathrm{R}} \mathrm{Q}, \quad x_{0}^{3} \in \mathrm{Q}$＂的否定是
A $\quad \exists \mathrm{x}_{0} \notin \mathrm{C}_{\mathrm{R}} \mathrm{Q}, \quad x_{0}^{3} \in \mathrm{Q}$
B $\exists \mathrm{x}_{0} \in \mathrm{C}_{\mathrm{R}} \mathrm{Q}, x_{0}^{3} \notin \mathrm{Q}$
C $\forall \mathrm{x}_{0} \notin \mathrm{C}_{\mathrm{R}} \mathrm{Q}, \quad x_{0}^{3} \in \mathrm{Q}$
D $\forall \mathrm{x}_{0} \in \mathrm{C}_{\mathrm{R}} \mathrm{Q}, x_{0}^{3} \notin \mathrm{Q}$