AG指的是( )

A、血浆中阴离子减去阳离子
B、血浆中阳离子减去阴离子
C、血浆中Na[img=~\/QImg\/2013-06-26-17-11-54\/image020.gif]与K[img=~\/QImg\/2013-06-26-17-11-54\/image020.gif]之和减去Cl[img=~\/QImg\/2013-06-26-17-11-54\/image018.gif]与HCO[img=~\/QImg\/2013-06-26-17-11-54\/image024.gif]之和
D、血浆中Cl[img=~\/QImg\/2013-06-26-17-11-54\/image018.gif]与HCO[img=~\/QImg\/2013-06-26-17-11-54\/image024.gif]之和减去K[img=~\/QImg\/2013-06-26-17-11-54\/image020.gif]
E、血浆中Cl[img=~\/QImg\/2013-06-26-17-11-54\/image018.gif]与HCO[img=~\/QImg\/2013-06-26-17-11-54\/image024.gif]之和减去Na[img=~\/QImg\/2013-06-26-17-11-54\/image020.gif]