He is busy and he has work to do. [ ]
A. much
B. little
C. many
D. few
答案:A
屈原《九歌》中的()一首是太阳神的颂歌,其中包含着英雄主义的精神和爱国情怀。
颗粒材料的密度为ρ,表观密度为ρ0,堆积密度为ρ0′,则存在下列关系()
A.ρ>ρ0′>ρ0
B.ρ>ρ0>ρ0′
C.ρ0>ρ>ρ0′
D.ρ0′>ρ>ρ0