影响铁吸收的因素有()。
A.体内铁的贮存量减少时,吸收量增加
B.维生素C等药物
C.食物组成
D.胃酸、胆汁的影响
E.肠道寄生虫病
参考答案:A, B, C, D, E
双孢菇菌丝生长最适酸碱度为多少?
The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications. What does “marked a great step” mean in the sentence?()
A.To run faster than ever
B.To go forward
C.To march without stopping
D.A significant symbol of a great improvement in maritime communication