A:天下兴亡,匹夫有责
B:民为邦本
C:天下为公
D:民贵君轻
NH4NO3 是一种化学肥料,某NH4NO3溶液的 pH=5,以下说法正确的是( )
若S1=∫12x2dx,S2=∫121xdx,S3=∫12exdx则S1S2S3的大小关系为( )
-- Which of the two shirts would you like?
-- Well, I have no idea. _______of them look nice.