About of the workers in the factory were born in the .
A:two-thirds, 1970
B:two-thirds, 1970's
C:the two-third, 1970
D:two-third, 1970
下列关于东北三省工业的叙述,错误的是
命题p:∃x0∈R,使得x02+x0+1<0,命题q: ∀x∈0,π2,x>sinx.则下列命题中真命题为( )
下列措施中,能使蒸发变快的是( )