患贫血的人需要在食物中增加的营养成分是( )
A:糖和脂肪
B:磷和钙
C:维生素和水
D:铁和蛋白质
Daming did his homework at home.(对划线部分提问)____did Daming ____ at home?
设P=1log211+1log311+1log411+1log511则( )