單項選擇題用醋酸纖維素薄膜對正常人血清中γ-GT進行同工酶電泳,往往只見()

A.γ-GT1和y-GT2
B.γ-GT1和7-GT3
C.γ-GT2和7-GT3
D.γ-GT2和7-GT4
E.γ-GT3和y-GT4