النشافات في جينجيا فرن احتراق الفحم إعداد المصنع تعديل ...
Vitamin B12 Deficiency And Diet: Can You Eat Your Way To ... Vitamin B12 Deficiency can take a number of forms. B12 is a watersoluble vitamin that plays a key role in everyday functions of the brain and nervous system, the metabolism of cells, DNA regulation, and the creation of blood.