28 有三個電阻器，電阻值分別為R1Ω、R2Ω、R3Ω，且R1＞R2＞R3，今將此三個電阻器並聯後，總電阻值為RTΩ，則下列何者正確？
(A)R1＞RT＞R2
(B)R2＞RT＞R3
(C)R3＞RT
(D)RT＞R1