简述促进铁吸收的因素。
(1)铁的存在形式,动物性食物铁易吸收;(2)食物成分,如维生素C、乳糖、有机酸和动物蛋白促进非血红素铁吸收;(3)肉因子;(4)生理因素,机体需要量增加时易吸收。
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In 1997, the geoscientist Brian Toon and colleagues found that a space rock half a mile wide would produce an explosion that releases the energy equivalent of up to 100,000 million tons (Mt) of TNT. And a meteorite a mile in diameter might send en