不定项选择Due to their low concentration, many of the trace elements are not important for the growth, development, and health of living organisms.
多项选择题假设命题变元 x 代表学生, 命题函数T(x): x 是计算机专业, S(x): x 上过离散数学课。陈述句:所有的计算机专业学生都上过离散数学课,对应的谓词表达式是: A、∀x (F(x) ∧ S(x)) B、∀x (F(x)→ S(x)) C、¬∃x (F(x) ∧ ¬S(x)) D、∃x (F(x) ∧ S(x))