2010 National Question 2 Single-choice Differentiating 2010_退役省自主命题 (2010·文) 2.下列命题中的假命题是 A. $\exists x \in R, \lg x=0$B. $\exists x \in R, \tan x=1$C. $\forall x \in R, x^{3}>0$D. $\forall x \in R, 2^{x}>0$ Answer keyC ☆ SaveCan't do it, show the explanation查看原卷 →