有下述命题
\(①\)若\(f(a)\cdot f(b) < 0\),则函数\(f(x)\)在\((a,b)\)内必有零点;
\(②\)当\(a > 1\)时,总存在\({{x}_{0}}\in R\),当\(x > {{x}_{0}}\)时,总有\({{a}^{x}} > {{x}^{n}} > {{\log }_{a}}x\);
\(③\)函数\(y=1(x\in R)\)是幂函数;
\(④\)若\(A \overset{⊂}{\neq } B\),则\(Card(A) < Card(B)\) 其中真命题的个数是\((\) \()\)