单项选择题

A.NaHCO/HCO<20/1,原发性HCO
B.NaHCO/HCO<20/1,原发性NaHCO
C.NaHCO/HCO>20/1,原发性HCO
D.NaHCO/HCO>20/1,原发性NaHCO
E.NaHCOHCO<20/1,原发性NaHCO