命题``$\exists x\in\text R,x^{3}-x^{2}+1\textgreater0$''的否定是
选项为:A:$\exists x\in\mathrm R,x^{3}-x^{2}+1\textless{} 0$  B:$\forall x\in\mathrm R,x^{3}-x^{2}+1\leq0$  C:$\exists x\in\mathrm R,x^{3}-x^{2}+1\leq0$  D:不存在$x\in\mathrm R$，${{x}^{3}}-{{x}^{2}}+1\textgreater0$  请回答其中一个选项.